First timer center diff (maybe) help

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Joined
Jun 6, 2017
Threads
5
Messages
23
Location
Minnesota
Cruiser experts, I recently picked up a 2000 LX 470. Don't love it, yet. Immediately replaced the seized up AHC system with Old Man Emu Medium kit. Holy stiff shocks. Will address that later, but my immediate issue is as follows:
Today I was driving at 60 down the highway. Suddenly heard a screech/howl/whirr/there's a UFO right above me crazy sound and then clunk. Let off the gas and have a whir/gear grind type of noise right beneath me. Another 5 miles till I got home. Burning smell was extreme upon exiting truck, and undercarriage was full of oil. What blew? Any advice on where to start would be greatly appreciated. Hope to like this old rig before too long. Thanks for reading!
 
Did you have the center diff lock on? Did you see TRAC OFF and center diff locked indicator lights on?
 
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No, diff lock button wasn't in and no indicator lights. That's another oddity, when I push the diff lock button there is no light. Like that since I got it so I thought maybe there wasn't a light for that. The oil was leaking from the center diff area I think, hard to tell as it was everywhere.
 
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Any chance to post a picture or two?
 
Appreciate the reply. Will have to wait till I can see better under there. Went to snap a pic and realized where it's dripping down from the center diff area might have just blown back from engine area. Full of oil under right side engine area and leaking on ground now too. Sorry for the vagueness. Front diff issue perhaps, I dunno. I didn't do the front diff drop bracket yet as I didn't think it was urgent with the 1.5" lift, but maybe something blew cuz I didn't drop the diff? It's only been 200 miles since adding the the Emu kit. I'll stop rambling, thanks for listening.
 
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oil under the engine area?
does it smell like gear oil- diff
black engine oil-engine
trans fluid-trans issue
since you said it is near the engine, gear oil could also be from the transfer case but not near the engine
 
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Definitely lost the oil from the pass side axle, which was just replaced before I bought the truck a month ago. It looks new but a faulty install perhaps. Hope I didn't burn up the front diff, but thinking something blew in there since I had the squeal kerplunkthunk noise out of nowhere. Getting it towed to an off-road shop on Monday. Thanks for the replies.
 
CDL lights often do not come on. This happens most often from lack of use. Just try backing and turn wheel all the way to one side. You'll know real quick if CDL is engaged as wheels/tires will feel like they bind and you'll hear tires skip. By repeatedly using CDL turning on for few minutes then off over next few months, this may free up the switch/relay (forgot whats it's called this $10 part in side of transfer case) any light may start working again. You should also hear (now) a faint click on PS from foot well, each time you press the CDL button on.

I've had the CDL locked on for days when light out, HWY and City driving. I had no bad effects. Not to say you can blow the transfer case just not what usually happens.

The front drive shaft being replaced recently, if aftermarket or a rebuilt. Then you did a lift. Good chance this is the issue and you may have blown a CV and its boot. Better then transfer case, I'll cross my fingers for you.

Gear lube from transfer case or differential(s) has a very nasty smell. Grease from CV doesn't have much of a smell, near odorless to me. That should be a big clue as to what blew!

Also possible that new inner snap ring (on axle of front drive shaft in differential) was not used or did not seat. Then you lift increase front drive shaft pull away from differential. It may have come unseated and axle come out so far front differential gear lube has blown pass the oil seal.



Good luck.
 
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Thanks for the CDL tips, will give those a try. And your take on the front axle and diff sound spot on to me. The oil was strong smelling but more of a burnt smell, not so much the rotten egg effect...which is what raised my concern that the diff internals burned up, if that's a thing. But what you said sure sounds like what happened. Appreciate your knowledge!!
 
You were right, CV axle was installed without a snap ring, and eventually pulled away from diff. My diff was toast as it ran dry of oil. So it now has one from a salvage yard and 2 new CV axles that ARE snapped in. This truck sucks. Just got that taken care of and a set of tires and wheels put on. Was out running errands today feeing good about finally driving the thing and theeennn...rough idle and check engine light. Multiple misfire on even bank of cylinders. Previous owner just bad timing belt done 500 miles ago. Might be related to something faulty there. Ugghhh, maybe I just need a new Civic. Thanks for listening.
 
When all is fixed you will love the LX.
It seems that the previous owner didn't maintain the car too well and you are getting all the issues.
When it is all fixed at least you know the car.

Not sure what your attachments are but I can't open them.
 
Sounds like you have had a bad run. You now definitely know why people recommend a full base-lining for the trucks when you get them, as well as why people are so passionate when they find a good place to service their trucks. Hope you get it all sorted so you can enjoy it.
 
You were right, CV axle was installed without a snap ring, and eventually pulled away from diff. My diff was toast as it ran dry of oil. So it now has one from a salvage yard and 2 new CV axles that ARE snapped in. This truck sucks. Just got that taken care of and a set of tires and wheels put on. Was out running errands today feeing good about finally driving the thing and theeennn...rough idle and check engine light. Multiple misfire on even bank of cylinders. Previous owner just bad timing belt done 500 miles ago. Might be related to something faulty there. Ugghhh, maybe I just need a new Civic. Thanks for listening.
CV:
I always like going with new OEM front Drive Shafts (AKA CVs) matched with new OEM hub flanges and cone washers. A must is servicing wheel bearing, setting proper breakaway preload and setting in a new hub flange snap ring to proper gap of < 0.20mm. I've yet to have one 100 series in my shop that didn't need wheel bearings service done properly. Toyota recommends this be done ever 30K miles. Along with lubing axle bearing and bushing.

Bring a new rig up to par:
I deal so very often in correcting what other shop have repaired. This is in 100 or 200 series others have asked me to fix or PM or ones I've purchased. Many shops just don't use the FSM, use inferior parts or assembling not using best practice, often taking short cuts. Or some well intention PO DIY job, without FSM or the skills just messes up.

This is where inspection comes in handy, looking for clues. I've become very good at finding stuff during PPI, but also find more once I've got a new rig home and do my 40 hour cleaning inspection. Then as I work on the rig, I can count on finding more than I've already found that needs some TLC.

I spend 400 to 800 hours on each of my 100 series restoring to showroom ready. But even then some stuff may come up latter that I missed or didn't show itself. I'll clock as many miles, in different condition so I can to work-out the bugs. But once restored they just need normal PM, are very reliable, safe to drive and will last as long as one is willing to maintain.

RH (even bank) miss fire:
With timing belt break, cam or crank sensor issues (loose or cut wire) we'll generally see both banks miss fire. But regardless I'd start by looking at wire mainly on LH (DS) in front of timing belt cover (cam sensor) and down the side snaked in AC compressor bracket (Crank sensor). Often sensor wires aren't secured properly and pulleys or belt rub cuts into them. Sometime the sensor are not secured properly, but they aren't generally removed. Also rodents love nesting and chewing on wires in our engine bays, so inspecting is key. We've even seen rodents get in timing belt area through a missing little piece of plastic not replaced during a T-belt job.

The timing belt tensioner is on the RH side and as such we see belt jump cam more often on that side than on LH cam. A weak tensioner or one not in torqued in properly or pin not pulled can result in belt jumping a tooth or two.

Make sure you've No coolant loss. If coolant was low or you're losing some find out from where. Biggest concern is head gasket. Inspect head gaskets 360 degrees for coolant's pinkish (assuming Toyota red coolant in system) crusty. Removing engine cover and undercarriage shielding and inspect with flash light and mirror. You'll want to see all of head gasket even under intake. A $40 drain snake camera is handy here as well.

Also I'd check that each spark plug is torqued in, coil torqued down and coil wire harness seated and all vacuum lines in good condition.

Here's one thing to consider, It's the over all condition. If this rig was from MN (rust belt) it may be a rust bucket. You'll need to really consider how much time and $$ you'll willing to poor into a rust bucket. They have limited resale and are much more work and $$ to restore. I've one now I'm working on that has more rust than I'd normally like to see, which works me harder than a rust free rig. It's a 00LX with 560K km on the clock, that spent some time in CN and possible a little in Boston at the university. It's not really bad rust and price was right so I've some room to put in $$. I'm nearing $4k just in parts now. $3-4K in parts is not unusual for me on a HM rig. But this one will always have limited value due to rust, body and paint. Most every body panel has scratches, nicks, dings or dents. It's the only Cruiser I've had, I'll park in front row of shopping center, as I'll never notice the extra dings.

But as a rule I do not buy rust!
 
and all vacuum lines in good condition.

I am trying to find all part numbers and location of those vacuum lines on toyodiy, without too much luck.
My car is misfiring after start up but it is gone when engine is at full temperature.
So it must be something what opens when cold and is sealed when engine is at temperature. So I was thinking of the vacuum lines.
They are 17 years old.
 
CV:
I always like going with new OEM front Drive Shafts (AKA CVs) matched with new OEM hub flanges and cone washers. A must is servicing wheel bearing, setting proper breakaway preload and setting in a new hub flange snap ring to proper gap of < 0.20mm. I've yet to have one 100 series in my shop that didn't need wheel bearings service done properly. Toyota recommends this be done ever 30K miles. Along with lubing axle bearing and bushing.

Bring a new rig up to par:
I deal so very often in correcting what other shop have repaired. This is in 100 or 200 series others have asked me to fix or PM or ones I've purchased. Many shops just don't use the FSM, use inferior parts or assembling not using best practice, often taking short cuts. Or some well intention PO DIY job, without FSM or the skills just messes up.

This is where inspection comes in handy, looking for clues. I've become very good at finding stuff during PPI, but also find more once I've got a new rig home and do my 40 hour cleaning inspection. Then as I work on the rig, I can count on finding more than I've already found that needs some TLC.

I spend 400 to 800 hours on each of my 100 series restoring to showroom ready. But even then some stuff may come up latter that I missed or didn't show itself. I'll clock as many miles, in different condition so I can to work-out the bugs. But once restored they just need normal PM, are very reliable, safe to drive and will last as long as one is willing to maintain.

RH (even bank) miss fire:
With timing belt break, cam or crank sensor issues (loose or cut wire) we'll generally see both banks miss fire. But regardless I'd start by looking at wire mainly on LH (DS) in front of timing belt cover (cam sensor) and down the side snaked in AC compressor bracket (Crank sensor). Often sensor wires aren't secured properly and pulleys or belt rub cuts into them. Sometime the sensor are not secured properly, but they aren't generally removed. Also rodents love nesting and chewing on wires in our engine bays, so inspecting is key. We've even seen rodents get in timing belt area through a missing little piece of plastic not replaced during a T-belt job.

The timing belt tensioner is on the RH side and as such we see belt jump cam more often on that side than on LH cam. A weak tensioner or one not in torqued in properly or pin not pulled can result in belt jumping a tooth or two.

Make sure you've No coolant loss. If coolant was low or you're losing some find out from where. Biggest concern is head gasket. Inspect head gaskets 360 degrees for coolant's pinkish (assuming Toyota red coolant in system) crusty. Removing engine cover and undercarriage shielding and inspect with flash light and mirror. You'll want to see all of head gasket even under intake. A $40 drain snake camera is handy here as well.

Also I'd check that each spark plug is torqued in, coil torqued down and coil wire harness seated and all vacuum lines in good condition.

Here's one thing to consider, It's the over all condition. If this rig was from MN (rust belt) it may be a rust bucket. You'll need to really consider how much time and $$ you'll willing to poor into a rust bucket. They have limited resale and are much more work and $$ to restore. I've one now I'm working on that has more rust than I'd normally like to see, which works me harder than a rust free rig. It's a 00LX with 560K km on the clock, that spent some time in CN and possible a little in Boston at the university. It's not really bad rust and price was right so I've some room to put in $$. I'm nearing $4k just in parts now. $3-4K in parts is not unusual for me on a HM rig. But this one will always have limited value due to rust, body and paint. Most every body panel has scratches, nicks, dings or dents. It's the only Cruiser I've had, I'll park in front row of shopping center, as I'll never notice the extra dings.

But as a rule I do not buy rust!
Thanks, yeah rust bucket is the name of the game here in MN. Thanks for the tips, much appreciated. Will see what the shop's fancy scanner says tomorrow and go from there. From what you said above it seems more and more like jumping teeth on the right side. According to receipt previous owner gave me, tensioner was replaced too. I don't know what "pin not pulled" even means but could be too. Thanks again.
 
I am trying to find all part numbers and location of those vacuum lines on toyodiy, without too much luck.
My car is misfiring after start up but it is gone when engine is at full temperature.
So it must be something what opens when cold and is sealed when engine is at temperature. So I was thinking of the vacuum lines.
They are 17 years old.
Yeah I'm no help there, sorry. Mine was already warm when misfire developed, but your theory on yours sounds logical.
 
Sounds like you have had a bad run. You now definitely know why people recommend a full base-lining for the trucks when you get them, as well as why people are so passionate when they find a good place to service their trucks. Hope you get it all sorted so you can enjoy it.
Thanks, yep, not a fun start to this purchase.
 
When all is fixed you will love the LX.
It seems that the previous owner didn't maintain the car too well and you are getting all the issues.
When it is all fixed at least you know the car.

Not sure what your attachments are but I can't open them.
Good point, thanks, hope to love it soon. Sorry, new to this forum stuff, don't even know how to add pics I guess. Was before and after tire/wheel install. Might not run right, but at least its looking good.
 

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