Originally Posted by CameronVP
Hey forum, so now after removing the head, they are saying that one of the cylinders is not firing, and that they can see water
has been in there. Theyre saying they need to pull the motor out and do a complete rebuild
. Whoa. Anyone have any thoughts on this? The quote is attached. Over $8,000.
I see no attachment.
I'm not so sure. Has it been smoking? I had a perkins
4-236 that was running on 3 cyls, you could hardly tell it. Long story short is the valve pushod had jumped off the rocker and was off when we removed the valve cover, possibly due to the rear cylinder getting water in it and starting the engine ...it jumped off. It wasn't even bent. The engine was near new.
The only reason a block would need to come out would be if something major mechanical was wrong: bad bearings or broken piston or piston ring. No compression
in that cylinder...And what in the world would this have to do with losing coolant? Are they saying the block is cracked?
I would send the head for pressure testing and flatness check first. Any head shop can do that doesn't have to be a marine
place. The other reason it may not be firing on one cylinder is a bad injector or injection pump. Was their raw fuel
on the water from the exhaust? If the cylinder was NOT firing then:
-There is no compression
. (in this case there would be raw fuel
on the water from the exhaust)
-There is no fuel (bad injector or bad injection pump)
-If a valve is stuck closed, it may force raw fuel into the oil
sump, even with good compression.
Do they have a specific diagnosis? Like a cracked piston or broken ring? Or just "let's rebuild it!"