Rear Main Oil Seal - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 04-27-2006, 04:34 AM
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Rear Main Oil Seal

I seem to have a oil leak from my rear main engine seal on my 86 4wd pickup. Oil is leaking through the clutch bell housing. Any thoughts or tips on changing the rear main seal? Any good diagrams or articles out there? I was told this will eventually wear out my clutch. Any thought on fixing the seal ASAP or should I wait until the clutch goes and just replace both at the same time.

Last edited by keereader; 04-27-2006 at 04:35 AM.
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#2 Old 04-27-2006, 05:29 AM
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http://www.truckporn.com/tech/1985toyotatruckfsm.pdf . this has the complete intstructions and any lists any specialy tools your going to need. and it has the tolerances for the clutch so if you can got a micrometer you can see if anything on your clutch needs replacement.
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#3 Old 04-27-2006, 09:36 AM
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obviously you'll have to pull the tranny out to change the rear main seal so i'll definitely reiterate that you want to be sure and inspect everything while doing this job (i.e. clutch, pressure plate, throw-out and pilot bearings.

One thing to be aware of is there is another source for the oil leaking out of the front of the transmission. The input shaft seal on the transmission might be culprit. It is actually easier to change than the rear-main on the engine. There is a retaining cover on the front of the transimssion (6-8 bolts depending on model). You car remove that cover and press out the seal and press in a new one. You can get the seal anywhere but the gasket will have to come from a Toyota Parts dealer.

Just be sure to check it while you have the tranny out.
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#4 Old 05-05-2006, 04:33 PM
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Transmission installation

Thanks again everyone for your help. I am now putting the transmission back in and having trouble getting it to slide in the last 1/2 inch or so. I have the top starter screw in and the pins lined up perfect. I have it supported with straps and a jack. It seems really centered and level. I can wiggle it but can't seem to get it foward any more. Any tips on gettting it in the final 1/2inch?
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#5 Old 05-05-2006, 05:47 PM
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put the slave cydlinder on and have someone mash the clutch while you push

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#6 Old 05-06-2006, 12:40 PM
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another thing you might try is to have someone turn the tail shaft of the tranny while it is in gear and push on the tranny towards the engine at the same time. Sometimes the splines on the input shaft aren't matched up to the spines in the clutch and you have to turn one or the other to get them to line up.
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#7 Old 05-08-2006, 12:28 AM
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still leaking

Thanks for the advice everyone. I got the tranny back in by turning the back of the tranny. However, it still seems to be leaking engine oil. I don't think I have the energy to take the tranny off for a few weeks so I am just going to drive it for now. However, any thoughts on were else an enginel eak from the front of the tranny could be coming from? It is certainly engine oil and not tranny gear oil. Any thoughts?
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#8 Old 05-08-2006, 09:49 AM
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is the oil still coming out through the bellhousing? I assume you changed the rear main oil seal. There are some oil galley plugs on the back of the engine that are within the bellhousing. It seems highly unlikely but i suppose one of those could be seeping.

If the oil isn't coming from the bell housing and just dripping off of the back of the engine it could be the oil pan gasket.
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#9 Old 05-08-2006, 06:13 PM
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crank repair sleeve

Anyone have any experience with crank repair sleeves? I was told the crank may have worn dond a using repair sleeve can fix the problem. Any thoughts? Thanks again
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#10 Old 05-08-2006, 06:35 PM
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I used a sleve to repair the groove on my crank pulley (created by the oil seal) on the front of the engine when i did a timing chain replacement. That was 17k miles ago and it hasn't leaked a drop yet. The pulley on the front pilots into the front main oil seal but it is a lot smaller in diameter than the rear part of the crankshaft. That is a possible cause of the problem. I wonder if you can get a repair sleeve for the rear seal?
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