My 4905's 8v71-T engine got dusted out while travelling Nevada's dusty roads. I replaced the seals in the turbo and blower and it still uses a gallon of oil every 100 miles. Still plenty strong though. leaks no oil whatsoever.
My questions are:
Where else but past the rings might the oil be going?
Can you replace the sleeves as an in frame job in a 4905?
Thanks for any help.
RickBrown in Reno, NV
The piston pin retainers and valve stem seals but to inspect the oil rings you have to remove a piston usually with bad oil rings the air box drain tubes just pour oil ,you need to roll the engine out to do a in frame makes life easy
Another question: is there a compression or blow-by test that can be done by removing only the valve cover and maybe some of the bric-a-brac below?
-RickBrown
Blower seals maybe. Valve guide seals probably. Maybe rings ... maybe not. Turbo seals maybe. Maybe not. The problem is that nearly all of this requires taking the engine apart. Expensive.
$Might$ be the time to "freshen up" your mighty Detroit with new blower seals, new rod and main bearings. New rings. Sleeves might be OK. Valve job. New valve guide seals. New turbo seals. New injectors. And ... an updated much better air cleaner arrangement.
You mighty mill might have been already tired ... without the additional dusting. Usually the coach will not literally run from air and dirt clogging BEFORE it should harm the engine ... if things are working properly. Just me. HB
Yea you can run a compression test but it's not a easy task on a 2 stroke you pull each injector and install the gauge and run the engine @ 600 rpm it should be 425# min to 475#.
Have you pulled the air box covers and checked for wear you can learn a lot by looking and checking the tension on the rings
I would pull the air box covers, even just one, and look inside. Mind you if you have already done the blower seals maybe you had the blower off and looked inside already. On my dusted engine the oil/dust/fuel sludge was a quarter inch thick on the whole inside of the air box. You could scrape it off with your finger, it was horrible. If you have that, personally I would stop asking questions and start raising money for the rebuild.
Brian
:)
The air box covers are unknown to me. If they leak oil where would it go?
I catch all the slobber (small in relation to the missing oil) and there is no oil on the ground or towed vehicle. My reading of the V71 engine service manual shows the rod/piston/sleeve assembly is removed out the top of the engine. A drill would be: pull the pan - pull the head - pull the piston/sleeve assembly - take those to a machine shop and have fixed - try to put it all back together. Now I am trying to discover if that work is necessary.
Thanks for any help
-RickBrown
Using a gallon every 100 miles with no leaks it has to be smoking like crazy because if it is not leaking it has to be mixed with air and fuel and the engine is burning it or trying too
Quote from: RickBrown on January 30, 2015, 04:15:24 PM
The air box covers are unknown to me. If they leak oil where would it go?
I catch all the slobber (small in relation to the missing oil) and there is no oil on the ground or towed vehicle. My reading of the V71 engine service manual shows the rod/piston/sleeve assembly is removed out the top of the engine. A drill would be: pull the pan - pull the head - pull the piston/sleeve assembly - take those to a machine shop and have fixed - try to put it all back together. Now I am trying to discover if that work is necessary.
Thanks for any help
-RickBrown
uhhhmm.. no... a machine shop cannot help those...they will need replaced.