my 460 blew a piston
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Joined: Jul 2001
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my 460 blew a piston
My 460 blew a piston at 81,000 miles. I replaced it with a new one , repairing cylinder wall , heads , seated valves ... everything. drove 200 miles. then another piston BLEW. Does anyone know reasons for this to occur???
I need help , fast !
Gray
I need help , fast !
Gray
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New User
Joined: Jul 2001
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my 460 blew a piston
it's a 1994 w/ FI . The whole side of the piston was blown out , ring pieces everywhere. The second piston we caught the problem before it completely blew apart. The 460 is in a Holiday Rambler Motorhome. 34 ft.
I appreciate any advise or reasons that this should be happening. the motor is not that old and 81,000 miles should be just "breaking it in"
Thanks , Gray
I appreciate any advise or reasons that this should be happening. the motor is not that old and 81,000 miles should be just "breaking it in"
Thanks , Gray
Elder User
Joined: Jan 2000
Posts: 966
Likes: 2
From: Crooked River Ranch, OR
my 460 blew a piston
I agree...severe detonation. Since your running fuel injection and a computor, I'm guessing two possibilities. One is fuel injectors that are clogged causing an extremely lean condition in that particular cylinder. When that happens the 0-2 sensor tells the computor to richen the mixture...the result is 7 cylinders running richer than normal(check for black-sooty tail pipe) and one cylinder still running lean.
The other possible reason could be way too much advance.
Just a note...80,000 miles in a motor home is more probably like running a car/truck for twice the miles. Your engine/tranny is ALWAYS under a load.
Deen Hylton
Ford F250 460 C-6, K&N, Headers, Dual Exh.,Comp. Cams,Shift Kit
Pioneer CD w/Bose Speakers.
Other Passion: Blown 77 Corvette (Sorry Guys/Gals)
How I can afford to Drive the above: 93 GEO Metro
The other possible reason could be way too much advance.
Just a note...80,000 miles in a motor home is more probably like running a car/truck for twice the miles. Your engine/tranny is ALWAYS under a load.
Deen Hylton
Ford F250 460 C-6, K&N, Headers, Dual Exh.,Comp. Cams,Shift Kit
Pioneer CD w/Bose Speakers.
Other Passion: Blown 77 Corvette (Sorry Guys/Gals)
How I can afford to Drive the above: 93 GEO Metro
Junior User
Joined: Oct 2001
Posts: 79
Likes: 0
From: MN , USA
my 460 blew a piston
Was it #8 cyl ?As i recall,that's the last cyl the fuel rail feeds via the injecter.I caught a spark plug melt down (twice) on a new F.I. motor in a van.A fuel filter change fixed the problem.
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