Rear main seal won't seal on 1999 TJ 4.0 due to scars on crankshaft
- Thread starter pc500
- Start date
If we pay that... Might as well get the stroker!
I'm guessing with a bit of luck we can do this for around $800. But that's assuming the cylinders aren't thrashed... Russian roulette once we open it up.
Hoping I can walk @pc500 through enough disassembly that we can determine viability, and order bearings and possibly pistons.
First suggested step was support the bellhousing, remove the transmission mount bolts, remove skid plate and get the exhaust off between the header and cat/muffler.
We need the oil pan off and we need the head off.
-Mac
Hoping I can walk @pc500 through enough disassembly that we can determine viability, and order bearings and possibly pistons.
First suggested step was support the bellhousing, remove the transmission mount bolts, remove skid plate and get the exhaust off between the header and cat/muffler.
We need the oil pan off and we need the head off.
-Mac
Found one for the front. Haven’t been in my Jeep rear seal area in a few years and can’t remember but I’m thinking you can’t Speedo sleeve the rear because of the bolt plate on the back of the crank.
https://www.partsgeek.com/lnmvyhs-jeep-wrangler-crankshaft-repair-sleeve.html
It would be impossible to use one , since the crank has the rear flange the flywheel mounts to .
Save me the trouble of logging out to see which idiot suggested a Speedi-sleeve and just tell me.
A stroker crank definitely won't have that pesky groove. Clearly solves a problem.
If your block is in very good condition you can run pistons for a standard bore, run a 0.027 head gasket and skip machining. You can still clearly see the factory crosshatch in mine at 82,000 mi.
I will continue to run my married cam and lifters which have no issues and decide later what roller cam I wanted to install to optimize the stroker as the stock cam will leave meat on the bone. I feel this is a better route than rolling the dice on a new flat tappet cam and lifter with the current state of issues. You can swap the cam in the vehicle if you remove the grill/radiator (and clear the AC lines).
If you're ordering stock piston size for a stroker, they're several weeks out right at the moment. Not that popular as most strokers get built after the motor has been thrashed. DSS can make you a set for forged ones within a week.
I gambled and replaced my lifters with new flat tappet Melling.
Machine shop said most new oils have detergents that remove ZDDP...zinc...VR1 or diesel oils... should solve it.
Worked once for me!
-Mac
I had to laugh at your comment Blaine . However , this is between you and the folks you've blocked . But hey , maybe someone has developed a new rubber band style Speedi-sleeve that can be installed past flanges or crank throws !
No worries, I will assume that the reason they are being ignored is for exactly dumbshit like this.
I may regret this, but I'll do it once. I have all the piston assemblies, cam, crank, etc. from a good running 4.0 that I ONLY saved due to them being out of a 80,000 mile motor. We sent the empty block out for a stroker build that never happened. I have zero use for them if someone wants them for the cost of shipping.
To be fair , you could use a Speedi-sleeve on the nose of the crank snout for a front seal repair ! Just no way on the rear seal area .
Yep wasn't thinking about the flange.... And as I said my Google Fo isn't that great so when I attempted to do a search it was returning some BS answers...
So I figured I'd ask the stupid question.....
But I have no issues with asking when I don't know something even if I get called names... I never claimed to be a expert..
We all have things we don't know about . Personally , I don't have an issue with someone not knowing something , as long as they are learning and moving forward . Because of things I've learned on this forum , regarding IT stuff , I now only suck at it , vs. totally suck at it .
It is interesting to see how the various personalities interact here . It can be easy to misread things .
@Wildman This idiot was wondering if I could till I realized it would be impossible. Be nice if you could though.
This idiot as in me, not you @Wildman
I'm COOL with being a dumbass.... Never claimed to KNOW everything and would rather ask the question and be called one than not know the answer...
I'm completely self taught. My dad didn't know anything about cars. I didn't have cool neighbors that did anything either.
I taught myself a lot of things before YouTube. Learned a lot of lessons the hard way. Broke stuff.
Still learning things.
There's a lot of tribal knowledge in mechanical work. Stuff folks assume you know so they don't document it or mention it. But if you don't know it...and are afraid to ask questions...bad consequences.
I've done enough IT support to know you've got to assume very basic skills when giving instructions and advice.
-Mac
I taught myself a lot of things before YouTube. Learned a lot of lessons the hard way. Broke stuff.
Still learning things.
There's a lot of tribal knowledge in mechanical work. Stuff folks assume you know so they don't document it or mention it. But if you don't know it...and are afraid to ask questions...bad consequences.
I've done enough IT support to know you've got to assume very basic skills when giving instructions and advice.
-Mac
Don’t sweat it. Never know unless you ask. If that offends someone….you're better off without them.
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