blowing rear main seal

[Doug Roberts]

well , getting ready to attempt it again. Each time , looks good early on but belches out quarts of oil. What could be going wrong ?

 

[gimpyrobb]

So your saying you've done it already?

Is the crank grooved? Might need a "speedy sleeve".

Have you checked the transmission isn't the culprit? Many belch G.O. on the clutch.

 

[Doug Roberts]

getting ready to do it the 4th time.

 

[DieselBob]

If it is for a fact engine oil I would suspect like stated above that it has enough wear or a defect in the surface of the crank hub to require a sleeve. Outside chance could be that for some reason the hub has to much radial run out.

 

[DieselBob]

Something else could be to much longitudinal crankshaft movement due to excessive clearance in the thrust bearings.

 

[gimpyrobb]

I'd lean toward the transmission.

Is oil getting on the clutch? That right there is the biggest indicator. Its pretty hard for engine oil to get to the clutch.

 

[Doug Roberts]

I'd lean toward the transmission.

Is oil getting on the clutch? That right there is the biggest indicator. Its pretty hard for engine oil to get to the clutch.[/QUOT


]I'm in it tomorrow , taking notes here to look for and will give feedback. I thank you for your expertise

 

[gimpyrobb]

Take some pics if you have time(and clean enough hands).

I'm guessing you'll drop the trans for this, might want to pull the input shaft cover on the trans and look at the workings in the front of the trans. (pics of that too)

 

[doghead]

Where are you getting your seals from? What brand and how old are they?

4 times, how far between?

What do the failed seals look like?

 

[Doug Roberts]

Input shaft is good, new input housing and mainshaft bearings good. It is leaking engine oil from rear crank seal, not gear oil from the transmission. No excessive end play on crank, crankcase breather is clear and not clogged. There's no excessive pressure from crankcase. Air compressor is not compressing crankcase either. We're getting the seal from White Owl in Kinston NC. Don't know the brand or how old it is.

 

[Doug Roberts]

should the seal be installed flush with aluminium housing or bottomed out in housing ?

 

[gimpyrobb]

Lots of good info in these 2 threads:

http://www.steelsoldiers.com/showthread.php?37345-Pulling-the-transmission!!!&highlight=transmission

http://www.steelsoldiers.com/showth...-transmission-today!!!&highlight=transmission

 

[gimpyrobb]

Post #20 in the 2nd thread has seal info.

 

[gimpyrobb]

Here is what I did, when I did mine.

http://www.steelsoldiers.com/showth...he-rear-main-seal-housing&highlight=rear+main

 

[m-35tom]

are there drain holes in the seal retainer? make sure you get a new seal, not old stock.