Sorry to read about your tranny issues, your rig is beautiful non the less. On the 4º shims, avoid shims made from aluminum. Steel shims will outlast the non ferrous ones.
Builds My R2.8 Cummins FJ40 (RJ40) daily driver build
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- Thread starter
- #362
Hey Steve! Sorry I must have missed this before. I think it's that a diesel engine flywheel does not have a constant angular velocity. So as it cycles it puts high and then low torque on the dampener springs. So a clutch disc built for a gas engine will rattle as the springs compress and decompress rapidly. At least that's what I've been told from multiple people during my research into it.
Apparently a dual mass flywheel could smooth all that out. I'm going to start shopping for one, seeing as I have to remove my damn transmission again anyway
Hopefully I did not lead you astray telling you to run the truck!
Without getting into too much detail the torsional signature of 4 cylinder inline engines exaggerate these types of noises across the geartrain. Diesel engines and the additional mass of their reciprocating assemblies take this a step further.
I would completely expect the noises that were described earlier on in this thread but do not believe they would cause any harm, especially this early on in service.
Maybe there was a pre-existing condition in the gearbox that both increased the sound further than expected and ultimately lead to failure? Additionally my experience shows that the heavier duty gearboxes are more prone to this type of noise. Generally speaking these bigger boxes have heavier gear sets with courser profiles which lend themselves to this type of sound.
Increasing the mass of the rotating assembly with a heavier flywheel would help calm the noise down and really smooth out the driving characteristics of this setup.
Beyond that we really need to get to the bottom of this failure.
At least you got her home!
Mike
Without getting into too much detail the torsional signature of 4 cylinder inline engines exaggerate these types of noises across the geartrain. Diesel engines and the additional mass of their reciprocating assemblies take this a step further.
I would completely expect the noises that were described earlier on in this thread but do not believe they would cause any harm, especially this early on in service.
Maybe there was a pre-existing condition in the gearbox that both increased the sound further than expected and ultimately lead to failure? Additionally my experience shows that the heavier duty gearboxes are more prone to this type of noise. Generally speaking these bigger boxes have heavier gear sets with courser profiles which lend themselves to this type of sound.
Increasing the mass of the rotating assembly with a heavier flywheel would help calm the noise down and really smooth out the driving characteristics of this setup.
Beyond that we really need to get to the bottom of this failure.
At least you got her home!
Mike
Sheck44
SILVER Star
Keep me in the loop guys ... I love the truck and the way it drives BUT would love to quiet it down if possible
Cheers'
Steve
Cheers'
Steve
- Thread starter
- #365
Haha I don't think so! Everyone I talked to including two mechanics (one that specializes in manual transmissions) said it was fine.
I'm guessing it was something pre existing. I'm just praying it doesn't have anything to do with my build. The angles I laid everything in at, driveshaft angles... ect. I really hope they find something blatantly wrong with the trans when we pull it this time.
I'm obviously pulling the tranny again, so I'd love to get a proper clutch disc and a heavier flywheel in there if possible. Do you know if Cummins has a heavier flywheel? There's so little info on this engine I can't seem to find anything online.
Haha yes! At least it's home. Unfortunately I don't have a garage at home that's got the tools that were available in Houston. A mechanic is gunna have to pull it this time..
I'm not sure what Cummins makes for your application, but it might come down to whatever quickdraw made your your flywheel.
You might have to contact them and see what the application their flywheel came from, or have something custom made.
It is not hard to find a machine shop to make a custom flywheel.
Mike
You might have to contact them and see what the application their flywheel came from, or have something custom made.
It is not hard to find a machine shop to make a custom flywheel.
Mike
Quick draw just machines Cummins flywheels with the correct bolt holes for the clutch.
@ArthurFJ did you resolve the trans issues? Curious what is found in the transmission. I would like to suspect something wrong from the get-go. I have on my bench now an NV4500 that was "fixed" by a trans guy, and it would have self destructed over time due to incorrect assembly.
The one I build for my diesel FJ40 makes no noise. I've driven a few others with 4 cylinder diesels and none had weird noises either. None were your exact combination of parts though, so I wouldn't completely rule out some weird impulse/harmonics situation..
The one I build for my diesel FJ40 makes no noise. I've driven a few others with 4 cylinder diesels and none had weird noises either. None were your exact combination of parts though, so I wouldn't completely rule out some weird impulse/harmonics situation..
- Thread starter
- #369
Hey Kleatus,
I finally got off my ass and brought the truck into a transmission shop a week ago. Turns out I had failed to properly seal a hole from the tcase to the adapter from AA. So the oil in the trans was leaking into the tcase and running dry. I had a "welded" synchro, a destroyed input shaft, a grenaded bearing, and the wrecked counter shaft. Cost me almost $5000 (Canadian) to fix it. So much more expensive up here than in Texas. But the guys gave me a 1 year warranty.
I drove it from there to another mechanic that's going to fix my e brake (el dorado conversion). I'd do it myself but I don't have a shop available to me up here like I did in Texas. They're also going to put in the 4 degree shims to help with my steering castor and get my out-of-province inspection done so I can register it and start driving it all the time.
While the trans was out I wanted to put in a different clutch disc, but none of the mechanics or clutch manufactures could point me in the direction of a 10.5" 10 spline diesel disc. So, looks like I'll just be living with the noise. I'll post a video when it's back on the road.
Thats a bummer, but glad you have have found the reason.
Awesome work btw, and great color choice. Motivation to finish painting mine!
POPO AGIE
SILVER Star
I am planning the same with the R2.8 mated to an H55F and split transfer case and FJ40 full floating rear axle.
- Thread starter
- #372
Nice! What's the plan for tire size and diff ratios?
POPO AGIE
SILVER Star
I am thinking 35" tires and leave the ratio alone to see how it works out with the 5 speed. Still in the planning stages have not bought anything yet.
- Thread starter
- #374
Nice. I ask because if I could go back I'd probably put 3.70 in the diffs. As it is right now, during city driving, I don't use 1st at all. The gear is just way too high so I start in 2nd. It'll probably help alot that you're using 35 inch tires. Mine are only 33s. Also, if you plan on rock crawling you probably want to leave the 4.11s in.. or go even higher
You have a NV4500, right? I think most people run it as a 4 speed like you do, starting in 2nd most of the time. I know I do.
- Thread starter
- #376
I sure do. Okay that's good to know. At least it'll crawl nicely if I ever do decide to take it offroad
POPO AGIE
SILVER Star
I live at higher altitude with strong head winds on I80 and the stock gearing would leave the 2F lacking. I use to get passed by semis and as soon as I was in there wind shadow it would speed up until the wind was not blocked and it was slow down again. I don't live in town now so I don't have to worry about city traffic and if I did go into town I would be doing 30 or less. For the few miles to get to town the speed limit is 65 mph anyway.
- Thread starter
- #378
Finally... Transmission is fixed, eBrake installed, and shims in to correct caster. The Ebrake was a HUGE pain. The only thing that could get those Cadillac El Dorado disc to engage was an electric frame mounted brake. I wish so badly I would have done more research into the brake mounted behind the tcase... Oh well live and learn. It's only my second day driving it but it's working well
POPO AGIE
SILVER Star
Glad to hear you got the transmission fixed.
I only want to deal with just 1 Ebrake not 2 so I will stay with the transfer case mounted brake.
I rarely use it anyway because living in Wyoming with arctic winter conditions you could find yourself walking because it froze.
I only want to deal with just 1 Ebrake not 2 so I will stay with the transfer case mounted brake.
I rarely use it anyway because living in Wyoming with arctic winter conditions you could find yourself walking because it froze.
How’s it driving now and is it any quieter???
