400m rear main issue.
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From: raymond alberta
400m rear main issue.
Bought an 83 bronco with a rebuilt 400m. New to this motor and carb all together. Problem is rear main pukes more oil than she burns in fuel. I can fix it myself no problem but I'm hearing this is a very common issue on this motor and I'm curious if there's any tricks to fix this other than replacing the seal and hoping for the best. Also i haven't seen the seal or anything yet is this a tranny out job or is there another way?
Thanks in advance
Thanks in advance
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From: wyoming
pull tranny!
if its as bad as you say might even pull the engine. but can be repaired in truck and worked. if leaking out the seal or out oil pan in the corners next to main cap. getting the oil pan to seal in corners can be tricky. I use a silicon called mr gskt. The (right stuff) in the corners. actual name of product right stuff good stuff and dont get on your clothes. doesn't get hard and sticks like tar, excellent sealer on oil pan gskt, corners.
if leaking out seal make sure installed in correct position/direction. also make sure not overfilled on oil.
if leaking out seal make sure installed in correct position/direction. also make sure not overfilled on oil.
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From: raymond alberta
Yeah I love that stuff (the right stuff) lol its dripping right out between tranny and engine so chances are it the rear main. But il take a good look at that pan too. Thanks.
Is there a lot of movement in the crank on these or what would cause it to be so common?
Is there a lot of movement in the crank on these or what would cause it to be so common?
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From: raymond alberta
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From: Tanilba bay NSW Australia
I hope that sorts it. Have fun with the pan. I hate doing that!! You would be loosening a few main bearings to let the crank drop a little to get the seal in out easier. Maybe remove a couple and check the bearings?? Loctite 515 good stuff and if you never want it to come off ever again permatex aviation sealant very good. goes on like runny tar but sticks like **** to a blanket.
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From: Tanilba bay NSW Australia
really serious about how that aviation sealant sticks. sounds like that right stuff mentioned earlier. a mongrel to clean off stuff you dont want it on. used on industrial diff repairswhen I first started working in the mines but a pain to clean off when rebuilding. Ended up using hi temp orange silastic/silicon in the future but I still have some of that at hoem just in case LOL
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As with any rear main seal the crush should always be checked. There is no guarantee that any seal is going to be right for your motor out of the box. A lot of leaks right off the bat are because of too much crush.
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From: raymond alberta
Next time I'm just going to pull the motor. Wow. What a pain lol. And ya there's no way that motor was rebuilt 60,000 km ago. Crank bearings are wore to ****. It may have been put into the bronc 60,000 km ago but there's no way it was rebuilt. Joy.
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From: Tanilba bay NSW Australia
That sucks friend. Merry xmas by the way 30 deg C here in aussie for xmas day. If it's not blowing smoke and goes ok, and if the crank is alright, maybe chuck a set of mains in it to keep it going for a while. Stay safe and have a good one
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From: Newport, N.C.
This contributes to quite a few oil leaks
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