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8V92 Oil Leak
Recently joined my mechanic in the pit to ogle the underside of my coach. Noticed a lot of oil on my starter motor. Really hard to find the source. Best guess is in the area of the alternator and compressor.
Are there common culprits with this engine? Will removing the hatch under the bed give me better vision into this general area?
thanks
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9 Replies
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Sure it’s oil and not power steering fluid? Had an issue a few years back and it was an o ring on pump. Hard to get to across batteries and behind motor but it was my problem. On starter side and running down. Mine leaked over a weekend on floor. Only way I could tell was clean area with brake cleaner and start and run and watch from top above batteries. If you can remove cover over bed it would be easy peasy. Mine doesn’t have that access. After having blower seals replaced last year at Stewart Stevenson had a oil leak and found out valve covers leaking. My engine was spotless until I had it in for seal replacement.
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The hatch does let you see exactly where you describe the problem. There are so many potential areas where leaks can occur you have no choice but to completely clean the collected oil and grit, go for a ride and see where it is coming from.
It could be everything from valve cover gaskets to leaks where the compressor or alternator are bolted to the block to the little allen head plugs at the end of the heads.
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Definitely oil. 2quarts down after 12 hour drive to HHI motor coach Resort.
When I get home I will open the bed hatch to explore
Thanks
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A two stroke is going to drink a little oil or it is coming out the slobber tubes. If the leak was 2 quarts in 12 hours the entire back of the bus would be covered with oil and under a parked coach there would be a black puddle.
Even a tiny leak looks massive on the ground.
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Liam, mine did the same thing a year or so ago, blew 3 quarts on a one way trip and almost a gallon back. Slowly started then got bad quick. Came out vent/slobber tubes. Hope it isn’t what mine was, “Blower Seals” after having seals replaced, no more oil usage.They said it could be several things, rings , turbo seals and blower seals. Stewart Stevenson, San Antonio,Tx. did the diagnostic and work.
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The back of my bus has oil spots all over it. Garage had a good spot where it’s leaking down from the starter. Just in a really tough spot to diagnose. One of those cameras on a snake the SWAT teams on TV use would sure help!
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Oil spots may not indicate a serious leak. But a fine film or mist across the entire rear of the bus might show a serious leak.
But the starting point is to clean the engine. If you can get it over a pit and power wash it or use abundant amounts of solvent or brake cleaner (dangerous) and get down to the bare metal or paint all leaks become much more evident.
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Thanks Jon. Will make a trip back to Elite Coach’s pit.
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If you use something like brake cleaner which is very effective make sure the area is well ventilated and you avoid a lengthy exposure. The stuff is nasty.
Products like Simple Green work really well if the accumulated oil and grit is not so thick you need to start removing it with a scraper.
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