AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
If it's burning that much oil then there's something serious amiss.. but having said that, if you keep filling it up with oil it'll keep running for the time-being.
You don't need to strip the engine just yet.. you need to work out what the problem is.... but if the beast had a cam-belt failure and a rebuild then that's an obvious contender as the culprit.
First of all have a compression test done on each cylinder so you can see which cylinder (if any) are running at low compression. If the rings or the bore were damaged in one or more cylinders, then it'll show up here.
---> When the did the rebuild, do you know if they fitted new rings? They could have cocked it up.. fitting oil scraper ring in upside down for instance. That's a relatively easy fix.
Do you know if they touched the valves at all? Again, they may have not touched the head at all if no valves were damaged, or they may have taken all the cams and valves out and re-ground the seats etc. and fitted new parts.
I'd guess the valves were clobbered but "looked okay" so stayed in there because most people don't like taking valves out if they look okay. It's easier/cheaper to be lazy and leave them in there. But if the valves are marginally bent they will be straining the valve stem seals so oil will be dribbling down the valve stems.
--> Look at the plugs in each cylinder. Any cylinder getting oil dribbling into it will leave oily or black plugs compared to the others.
Of course, if your rings/bore and valves check out okay, it could be a good old fashioned valve stem seal failure (coincidental) or the beast may have a leak from the oilways into one of the bores (head gasket) but these are less likely given the engine's recent history.
Forget all about the rough running for the moment... that's certainly just a side effect of the beast burning all that oil instead of petrol.
No bullets for Chaingun..