Mercruiser 5.6L melting sparkplug electrodes
 

Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.

In article . com,
says...

Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.


Man do you need to correct this problem right now!!!! Your piston tops
and valves are next for the melt down!!!!

You are starving for fuel, she is lean for some reason. Weak fuel pump,
pinched fuel line, dirt in the strainer, look, look, look, til you find.

Your timing could be to far advanced causing detonation and ping, but
your trained ear listening to your engine with the lid open will be
your guide. If you continue running as is you're going to hear bang, and
that puff of smoke is going to be real expensive!

Gummi, Icelandic viking in America.

I agree does sound like lean running or detonation.

"Gudmundur" wrote in message
...
In article . com,
says...

Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.


Man do you need to correct this problem right now!!!! Your piston tops
and valves are next for the melt down!!!!

You are starving for fuel, she is lean for some reason. Weak fuel pump,
pinched fuel line, dirt in the strainer, look, look, look, til you find.

Your timing could be to far advanced causing detonation and ping, but
your trained ear listening to your engine with the lid open will be
your guide. If you continue running as is you're going to hear bang, and
that puff of smoke is going to be real expensive!

Gummi, Icelandic viking in America.

timing, fuel flow, or vacuum leaks!

wrote in message
ups.com...
Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.

Also worth checking is the heat range of the plugs you are using. Make sure
the plugs are those called for in the Mercruiser Manual not the GM Manual.
They could be the same but likely are not.

Butch
"Woodchuck" wrote in message
...
timing, fuel flow, or vacuum leaks!

wrote in message
ups.com...
Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.

Thanks guys. Fule pressure checked with guage is fine. Carb recently
rebuilt. Vacuum is normal at start up but does drop significantly at
4000 rpm. Any other ideas. All fuel lines have been checked and fuel
pressure is right on. Strange stuff. Thanks for your help.

wrote:

Thanks guys. Fule pressure checked with guage is fine. Carb recently
rebuilt. Vacuum is normal at start up but does drop significantly at
4000 rpm. Any other ideas. All fuel lines have been checked and fuel
pressure is right on. Strange stuff. Thanks for your help.



The carb was recently rebuilt? That waves a red flag to me.
Providing the timing is correct (that's about the easiest thing
to check) I would think about having another look inside that
carb. I may just be that something got messed up a little on
reassembly.

-Raf


--
Misifus-
Rafael Seibert

http://www.ralphandsue.com

She's lean, dude. Also, may be incorrect plug heat range, incorrect
timing advance curve contributing. Better fix it right away, before your
motor melts down.
JR

wrote:
Srange behavior here. 1988 5.7L Alpha One is melting about 5 spark plug
electrodes. Have tested everything we can think of. Any ideas? Thanks.



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