trendsetter240
Lieutenant
- Joined
- Jun 22, 2009
- Messages
- 1,458
Hi folks,
I've got a new to me 1996 Evinrude 115 V4 looper that I bought as a rebuild project. The motor has one low piston at only 30psi. The rest of the cylinders are at 130-140 psi.
The previous owner stated that he was told it was the OMS/VRO that failed. I'm always sceptical of this so I wanted to dig deeper to find the real cause before I spend a bunch of money on the rebuild. The service history from this past summer shows the motor had the carbs rebuilt in July. At this time all cylinders were at 130-150 psi. Then, in August the motor was brought in again complaining of won't rev much past idle and stalls. The test report shows that the #3 cylinder reads 30psi with scored cylinder.
I have already completely torn down the motor and examined the pistons and cylinders. The number 3 cylinder is indeed scored and the rings are melted to the piston. I pulled apart all the carbs and checked each one. They are in perfect condition, and all passages are clean and clear.
I inspected the reed valves and they appear to be in excellent shape and leafs move as expected.
SO...I had suspected maybe the carb the #3 cylinder had failed causing a lean condition and the failure. But now I'm not so sure...Everything appears fine with that carb (and the others).
So is it possible that this failure was a result of the OMS pump? I plan on running mixed fuel after rebuild but I would feel much better if I could identify what the cause of failure was.
Pics to follow in the next post.
Any help would be much appreciated.
Cheers
I've got a new to me 1996 Evinrude 115 V4 looper that I bought as a rebuild project. The motor has one low piston at only 30psi. The rest of the cylinders are at 130-140 psi.
The previous owner stated that he was told it was the OMS/VRO that failed. I'm always sceptical of this so I wanted to dig deeper to find the real cause before I spend a bunch of money on the rebuild. The service history from this past summer shows the motor had the carbs rebuilt in July. At this time all cylinders were at 130-150 psi. Then, in August the motor was brought in again complaining of won't rev much past idle and stalls. The test report shows that the #3 cylinder reads 30psi with scored cylinder.
I have already completely torn down the motor and examined the pistons and cylinders. The number 3 cylinder is indeed scored and the rings are melted to the piston. I pulled apart all the carbs and checked each one. They are in perfect condition, and all passages are clean and clear.
I inspected the reed valves and they appear to be in excellent shape and leafs move as expected.
SO...I had suspected maybe the carb the #3 cylinder had failed causing a lean condition and the failure. But now I'm not so sure...Everything appears fine with that carb (and the others).
So is it possible that this failure was a result of the OMS pump? I plan on running mixed fuel after rebuild but I would feel much better if I could identify what the cause of failure was.
Pics to follow in the next post.
Any help would be much appreciated.
Cheers