Cylinder not firing

[EClass20]

A friend of mine has a Merc 3.0, alpha 1. Just found out #4 has 0 compression via a leak down test. Mech gave him a quote of $1600 to repair. Sounds way high to me. Any insight?

Thanks.

 

[sqbtr]

Re: Cylinder not firing

What did the leak down test show. Ex, Int, Crankcase?

If it's leaking out the crankcase it's probably a holed piston. In that case I would think $1,600 is cheap.

 

[EClass20]

Re: Cylinder not firing

He said either a broken valve or a head gasket. Motor is a '92. $1600 to machine and rebuild.

 

[sqbtr]

Re: Cylinder not firing

Did he do a leak down test or just a compression test?

 

[jerryjerry05]

Re: Cylinder not firing

Got to remove the head to see what the real problem is.
It could be a bad head gasket or a blown piston.Do that and pics always help.J

 

[cr2k]

Re: Cylinder not firing

Could also be a cracked head or block.

The 3.0 is a great little engine, BUT they do not take well to things like overheating, freezing, or lack of maintenance.

If properly AND regularly maintained they will last forever.

 

[Don S]

Re: Cylinder not firing

A friend of mine has a Merc 3.0, alpha 1. Just found out #4 has 0 compression via a leak down test. Mech gave him a quote of $1600 to repair. Sounds way high to me. Any insight?

Thanks.

That price isn't bad, even if it's just a bad valve.
The troublshooting cost too ya know, then you have take apart clean, repair, reinstall, and test run, plus gaurentee your work. With no parts and charging only 75 per hour, that's only 21 hours to do that job in the boat. We also can't see what access you have to your engine. Half of it may be under the back of the boat. Any parts will take away from that 21 hours.

 

[Dakota47]

Re: Cylinder not firing

Buy a New longblock from Rapid o marine for the same cost .