Builds 1988 BJ74 “Number 1” (3 Viewers)

[Rigster]

The front timing case is the gift that keeps giving…

Pretty sure some is leaking around this bolt. It doesn’t say anywhere to use sealant but I might try some and see if that gets rid of it.

View attachment 3880154

Here I’m not sure if it’s around the crank seal or not…it wasn’t leaking before and I changed the seal when I took it apart…maybe that was a bad idea.

View attachment 3880156


View attachment 3880160


It looks like I may just have to pull it again and use FIPG…it never leaked like this before on the timing cover.

The timing (no pun intended) of this is ironic. I literally just had this conversation with my middle son about his 'rear' engine seal on his VW GTI. He is swapping his 5 speed transmission with a 6 speed and was asking if he should do his engine seal before he puts the 6 speed transmission in.

I said sometimes that can create a problem, and if the original is good, it might be best to leave it. I left the decision up to him, but said it is not too hard to get the transmission out and do it if it ever does start leaking - it's not like a transmission/transfer case of a land cruiser!

Sorry to hear of the new seal leak... so frustrating when you already put the time and $$$ in to avoid this exact scenario!! I would not want to be that Murphy guy if any of us finally catches up with him...

 

[FJBen]

So this bolt.

How would one seal it? Thread sealant isn’t going to work as it goes through the timing case. It appears to be leaking on one or. Oh sides of the washer. It’s torqued to the correct amount but possible there’s a divot or something allowing oil out?

Not sure a copper washer can get enough crush but I could be wrong.

Not sure FIPG will work in this situation.

New bolt and washer?

 

[AirheadNut]

Do you have a photo of the back side of the timing case in that location? I'm assuming that it is supposed to be sealed by the timing case gasket going around that bolt hole, but isn't currently sealing for some reason. You could certainly try using a crush washer, not sure what the torque spec is for that bolt but it doesn't take a lot to get a copper or aluminum washer to seal.

 

[bj70bc]

issue would be in the gasket not the bolt/washer....no?

If it was me id pull it clean the hole and threads well (and quickly) fill the hole and threads with 'the right stuff' and torque it home, see what happens.

When i did my oil pan gasket there was oil that wouldnt stop dripping on the back by the transmission and 'the right stuff' bit through the weeping oil to seal the pan....

 

[FJBen]

issue would be in the gasket not the bolt/washer....no?

If it was me id pull it clean the hole and threads well (and quickly) fill the hole and threads with 'the right stuff' and torque it home, see what happens.

When i did my oil pan gasket there was oil that wouldnt stop dripping on the back by the transmission and 'the right stuff' bit through the weeping oil to seal the pan....

It appears that the oil is coming around the bolt and then dripping down. The bolt passes through the case so it’s exposed to oil inside.
Here’s a closer picture.

I see it’s a split washer there, not sure if it’s supposed to be but in my head the oil is coming from here, not the gasket.

 

[FJBen]

Do you have a photo of the back side of the timing case in that location? I'm assuming that it is supposed to be sealed by the timing case gasket going around that bolt hole, but isn't currently sealing for some reason. You could certainly try using a crush washer, not sure what the torque spec is for that bolt but it doesn't take a lot to get a copper or aluminum washer to seal.

I’ll try and get a photo of the backside. I guess my thought on the gasket is that the holes were bigger than the bolts so im not sure how that would seal.

 

[AirheadNut]

I didn't word my question very clearly, I was curious about the sealing surface of the front timing cover and the gasket that seals it. I am guessing that it uses a paper gasket similar to the transfer case gaskets and should seal around the bolt holes. If that is the case then that bolt shouldn't be exposed to oil on the inside.

This is the sort of gasket I was thinking about: the gasket extends around each fastener hole and seals the inside of the case from the fasteners.

 

[FJBen]

I didn't word my question very clearly, I was curious about the sealing surface of the front timing cover and the gasket that seals it. I am guessing that it uses a paper gasket similar to the transfer case gaskets and should seal around the bolt holes. If that is the case then that bolt shouldn't be exposed to oil on the inside.

This is the sort of gasket I was thinking about: the gasket extends around each fastener hole and seals the inside of the case from the fasteners.
View attachment 3890684

Yes the gasket is like that, I’ve been sleep deprived…

So possibly the gasket was nicked or something allowing oil in is what I’m thinking. That’s the only way it could be coming out of that bolt hole.

Maybe I just have to right stuff in the bolt hole and head and see if that stops it.

 

[LJRay]

…I was about to ask AI for a close-up photo of a bolt showing leaking oil from a dodgy gasket framed with a beautifully vignetted Texas sunset in the background, and then thought I should be able to find one here

 

[JuanJ]

I see it’s a split washer there, not sure if it’s supposed to be but in my head the oil is coming from here, not the gasket.

Hello,

OEM bolts do not have split washers.

From the manual, OEM bolts with washers are either Class 4T (no marks on the head) or Class 6T (two protruding lines opposite each other.)

OEM bolts with a 6 on their heads do not have washers and are Class 6T.

Hope this helps.





Juan

 

[LuckyDragon88]

Gaskets mostly seem to fail in places where the gasket is thinnest, (diffs around the cutout for the gear ring, main seals around bolt holes/thinnest spots, etc) I would guess a bit of contamination on the mating surface, short (ish) term use the "right stuff in the bolt hole and around the head with the correct washer, long term you know the answer...

 

[FJBen]

Hello,

OEM bolts do not have split washers.

From the manual, OEM bolts with washers are either Class 4T (no marks on the head) or Class 6T (two protruding lines opposite each other.)

OEM bolts with a 6 on their heads do not have washers and are Class 6T.

Hope this helps.





Juan

Interesting. There are a couple of these bolts and I took them out when I first did it and pretty sure the engine wasn’t opened up before. The washer doesn’t come off but I’m wondering if it cracked for some reason, it’s not a standard looking split washer so it’s possible it’s aftermarket.


Obligatory sunset bolt picture…

Gaskets mostly seem to fail in places where the gasket is thinnest, (diffs around the cutout for the gear ring, main seals around bolt holes/thinnest spots, etc) I would guess a bit of contamination on the mating surface, short (ish) term use the "right stuff in the bolt hole and around the head with the correct washer, long term you know the answer...

Yeah I slapped a little right stuff on time if that stops it. Not really looking forward to doing that job again. If I do, it’s another gasket and FIPG on both sides.

 

[bj70bc]

goop it

 

[FJBen]

Battery tray, yeah it was time especially with the heavy odyssey battery.

Weird camera angle but yes they are identical and it fit great. Got from @cruiseroutfit private stash of parts in the upstairs room.

I also slapped some right stuff on/around the bolt. It’s not a great solution if it works until I can pull the whole thing again then I’m ok with it.

 

[Eurasiaoverland]

I've cleaned up two pairs of front/rear timing cases from B engines, the old gaskets dry and compress into something like Kevlar or ablative tiles from the Space Shuttle. It took hours of scraping to get it off. If you've left any fragment on there or gouged the surface badly, that's likely to be the cause of a leak. The bolt itself is not meant to seal anything, it's all done by the paper gasket.

Any Toyota bolt with a part number 91611, 91651 and many more will have a split spring washer. 91651- bolts will have a plain washer below the spring washer. The front timing cover bolts are mostly 91611-60835.

 

[FJBen]

I've cleaned up two pairs of front/rear timing cases from B engines, the old gaskets dry and compress into something like Kevlar or ablative tiles from the Space Shuttle. It took hours of scraping to get it off. If you've left any fragment on there or gouged the surface badly, that's likely to be the cause of a leak. The bolt itself is not meant to seal anything, it's all done by the paper gasket.

Any Toyota bolt with a part number 91611, 91651 and many more will have a split spring washer. 91651- bolts will have a plain washer below the spring washer. The front timing cover bolts are mostly 91611-60835.

Great info. When I rebuilt it a few years ago, they were cleaned at the machine shop and no residue. I used FIPG but probably didn’t seal it up the best.

When I got a gasket I cleaned it all off but it’s possible I nicked something putting it on. The sealant around the bolt while ugly, did stop it from leaking yesterday and so far today. it’s completely possible that gasket is damaged around that bolt hole or the aluminum is nicked.

if I do it again I will just use FIPG and use my trick of a heat gun on the automatic timer spot rather than boiling it up to temp then putting on.

 

[FJBen]

So unexpected changes…

a year to the day….after my beloved wolfhound Finn had to be put down, my wife snuck this little sasshole home from the place we got Finn years ago.
It’s a pretty crazy turn of events that led to her coming to us and that was completely unplanned.

Irish wolfhound puppy was not on my bingo card for awhile. Yet to have her first cruiser ride, so I hope she loves it as much as Finn did.

11 weeks old, Maeve I think is the settled on name.

 

[Gun Runner 5]

So unexpected changes…

a year to the day….after my beloved wolfhound Finn had to be put down, my wife snuck this little sasshole home from the place we got Finn years ago.
It’s a pretty crazy turn of events that led to her coming to us and that was completely unplanned.

Irish wolfhound puppy was not on my bingo card for awhile. Yet to have her first cruiser ride, so I hope she loves it as much as Finn did.

11 weeks old, Maeve I think is the settled on name.

View attachment 3894690

I assume you plan to take another photo that features both the dog and a sunset?

 

[bj70bc]

thats the face of a dog thats planning on chewing some shiit up

 

[FJBen]

thats the face of a dog thats planning on chewing some shiit up

You would be correct. My 2yr old granddaughter said “she’s chewing on my couch!”