Keffer inc Posted August 7, 2013 Share Posted August 7, 2013 (edited) I have an oil leak from between the motor and the bell housing on the passenger side. Doesn't appear to be valve cover gaskets bad. I know I need a better look but what might I be dealing with? This is on my 1999 CH613 355/380 motor with spicer 10 speed. Edited August 7, 2013 by Keffer inc Quote Link to comment https://www.bigmacktrucks.com/topic/32239-355380-leaking-oil-behind-motor/ Share on other sites More sharing options...
hatcity Posted August 7, 2013 Share Posted August 7, 2013 sounds like it could be the rear main seal is starting to go. Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/32239-355380-leaking-oil-behind-motor/#findComment-198408 Share on other sites More sharing options...
br549 Posted August 7, 2013 Share Posted August 7, 2013 It could be the oil pan gasket. Our 2000 CX model seeped oil on the passenger side between the block and flywheel housing from about half way from the top down. We lived with it for about 5 years finally at a million 3 we pull the transmission to replace the clutch ( a solo clutch, the most I have every had a clutch go, but also only 1 driver on the truck since new) we pulled the flywheel housing and put new rubber sealant on it,there is no gasket just rubber sealant, also replaced the rear cam plug it was just about rusted out. If it is the cam plug you can see a small hole about 3/4 of the way up between the flywheel housing and the block, I think it would leak bad if it was leaking there. Good luck Quote Link to comment https://www.bigmacktrucks.com/topic/32239-355380-leaking-oil-behind-motor/#findComment-198410 Share on other sites More sharing options...
theakerstwo Posted August 7, 2013 Share Posted August 7, 2013 You can do same thing as a commercial shop does to find a leak. Wash and run it and look. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/32239-355380-leaking-oil-behind-motor/#findComment-198448 Share on other sites More sharing options...
39 Baby Mack Posted August 7, 2013 Share Posted August 7, 2013 You can do same thing as a commercial shop does to find a leak. Wash and run it and look.That's so simple, sorta makes common sense!!!!!Ron Quote Link to comment https://www.bigmacktrucks.com/topic/32239-355380-leaking-oil-behind-motor/#findComment-198476 Share on other sites More sharing options...
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