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I have two R models a 98 & 03

Both have oil leaks at the back of the engine AFTER the transmission has been out, rear structure resurfaced, new rear main seal and oil pans resealed. Any insight to what the problem may be?

 

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22 hours ago, JoeH said:

If it's an auto then you probably have cracked flywheel housings.

It is a automatic in the 98

Flywheel housings on both trucks went to machine shop to be squared up.

not sure about cracks

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Look along the flywheel housing from the starter motor, up over the top to about a 2:00 position. Mack dealer couldn't get one, but I found one aftermarket at a warehouse in Allentown PA, picked it up.about an hour after talking to the guy. I think it was about half the price Mack wanted for it.

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If it's cracked then call your Mack dealer and get the part number for the housing, there's a lot of aftermarket supply for them, you just need to Google the part number and pick a supplier. It's a common failure, and there's a lot of auto garbage trucks demanding them.

Note the aftermarket part number will be a close match but will be missing one digit.  And your old bell housing to flywheel housing bolts likely won't fit, I think the original is metric and the aftermarket is SAE. Or other way around.

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JoeH has good point as well as 880 Joe, and This Joe, asks,,, when you put the flywheel housing on did you put a generous bead of MACK GRAY RTV, around the mounting surface on the block and cam plug seam? 

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  • 2 weeks later...
On 4/29/2023 at 9:56 AM, 03' Big Red said:

I have two R models a 98 & 03

Both have oil leaks at the back of the engine AFTER the transmission has been out, rear structure resurfaced, new rear main seal and oil pans resealed. Any insight to what the problem may be?

 

Ever find the leak?

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