s.hadley81
Petty Officer 1st Class
- Joined
- Jun 22, 2011
- Messages
- 245
To make a long story long my mercruiser 89' 120hp I had a problem with water in the cylinders (blown out riser gasket) I got that taken care of and oiled and dried it but I've been having a problem with acceleration it just kinda breaks up and hesitates, it will reach wot after a little bit and would pop through the the carb ,not bad but it did pop back a couple times, when trying to find this problem is when I found the water intrusion so I thought that was the problem but it wasn't , since then I've completely ruled out fuel because my carb was just rebuilt and I cleaned and double check my float plus it ran fine after rebuild, I replaced filters , new fuel pump , I ran on remote tank , I checked timing and distributor advance weights so I pulled valve cover to have a peek figuring something mighta bent trying to compress water and everything looks great , all valves move,and no play ,so I read online a trick is to mark the pushrods and see if they turn to check for bad cam lobe or lifter, all did except #1 exhaust i think, I gotta double check the book to see if it's exhaust or intake valve, so I pulled that push rod and it's fine and straight, I was wondering if anyone ever heard of marking the pushrods and checking for rotation, I also forgot to mention I tested compression and all 4 are around 145psi that's good and after thinking about it an exhaust valve not opening fully would make sense as that's how the motor felt like its being choked, my other question is would a piston trying to compress the water wipe a cam lobe or collapse a lifter without bending the rod , sorry for the long winded post I just wanted to put as much info out there as I could think of and post everything I found out so I could get some input before I pull the head
Thanks a lot in advance
P.s I also drained my oil and there was water in it (not much at all maybe 4oz ) And after fixing the riser gasket it's clean so I strained the oil and cut open the filter and no metal just a tiny bit of crud nothing outta the norm,another thing I didn't mention was it only acts up under a Load in the water, sorry having a hard time trying remember everything I went through
Thanks a lot in advance
P.s I also drained my oil and there was water in it (not much at all maybe 4oz ) And after fixing the riser gasket it's clean so I strained the oil and cut open the filter and no metal just a tiny bit of crud nothing outta the norm,another thing I didn't mention was it only acts up under a Load in the water, sorry having a hard time trying remember everything I went through
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