Oil injection check valve

[AKnarrowback]

I'm trying to trace down possible problems before I take the motor down.

I have a 97 GTX with the 787. It only has 97 hours on it but has a problem of raw oil collecting in the mag side if it sits for a week or longer. The first thought is a bad crank seal around the rv shaft gear chamber, but this machine is in near perfect condition, has never been sunk, adult owned and, with 97 hours on an oem crank, a seal failure seems difficult to believe.

Has anyone seen the check valves for the oil injection lines fail on these motors. I'm throwing around the idea around.

I know you are thinking "just go check it", but I'm sitting on the job site full of adrenaline because this machine was given to me last night. Almost perfect condition, less than 100 hours, runs like a top once you burn the extra oil out of the mag side and I'm just praying it's not a crank seal. I'm hoping the low use, maybe mixed oils sitting in the tank over the years produced an aged mix that might have locked/blocked the check valve open.

Any thoughts?

 

[Ankeneyou]

Its mostly likely the crank seals as there are no check valves in the RV feed lines. Usually the cause is the wrong oil being used. TCw3 oil causes the seals to swell and fail prematurely.

You can add a valve on the RV feed line that goes under the carbs and shut the valve off when you are done riding and it will help keep the engine from filling with oil. Most people put their key on the valve to remind themselves to turn the valve on before riding again.

 

[kmarts]

Its mostly likely the crank seals as there are no check valves in the RV feed lines. Usually the cause is the wrong oil being used. TCw3 oil causes the seals to swell and fail prematurely.

You can add a valve on the RV feed line that goes under the carbs and shut the valve off when you are done riding and it will help keep the engine from filling with oil. Most people put their key on the valve to remind themselves to turn the valve on before riding again.

What he said.