Mechanics

WHY DOES MY F250 DESTROY ITS MOTORS?

1967 Ford F-250 • 99,000 miles

The ford came with a 352 engine but blew it up so we put a 390 in it and it blew it up too, we thought it might have a vacuum leak but ruled it out with the 4-5 motors we put into it. Any ideas?
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BriAN
May 6, 2012.




What exactly is it doing that it takes out all those engines?

Tiny
Rasmataz
May 6, 2012.
The 352 spun a rod, the others (all 390s) dropped its valves, ate its valves, the motors would ping and make unnecessary noises, the muffler would blow itself open when the motor backfired when it was cold.
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Tiny
BriAN
May 6, 2012.
Seems to me you're being sold engines that are no good to be doing all those things-next time you buy an engine make sure you hear it running before you install it-

Tiny
Rasmataz
May 6, 2012.
Ok thanks

Tiny
BriAN
May 6, 2012.
Make sure that if you are using the same distributor that it is working correctly with the mechanical & vacuum advance, the pinging may be a distributor problem that you are shifting to each engine you install.

Mhpautos
May 7, 2012.
I've traded out engines with my customers that have the same f-250 with no problems what so ever and the second it lands in this pickup it kills itself. Would it even be an engine problem?

Tiny
BriAN
May 7, 2012.
I'D GO WITH THE "BAD APPLE" THEORY IF THESE HAVE ALL BEEN SALVAGE YARD SPECIALS

INSTEAD OF SINKING YOUR MONEY INTO USED ENGINES, WHY DON'T YOU GO WITH GETTING ONE REBUILT?

THAT'S WHAT I DO FOR MY JEEP CJs--MOST OF MY IMMEDIATE FAMILY ARE STILL DRIVING OLDER VEHICLES WITH "BASICALLY" A "NEW-LIKE" ENGINE

BEFORE MY DAD GOT SICK WITH AGENT ORANGE RELATED CANCERS (NOW DECEASED) ABOUT TWO YEARS AGO, HE AND I PULLED AND TORE DOWN HIS '76 FORD F-150 (NOW WITH A 351 WINDSOR), TOOK IT TO A AUTO MACHINE SHOP AND HAD IT TOTALLY MACHINED. WE BUILT AND INSTALLED THE ENGINE, COMPLETE WITH A NEW OIL PUMP, A WATER PUMP, ALL NEW NECESSARY GOODIES ('STAT, PLUGS, OIL, AND SUCH), AND A CLUTCH SET. TOTAL COST WHEN WE GOT DONE WAS ABOUT $1600. NOW IT'S EXACTLY AS GOOD AS A BRAND NEW ENGINE!

WE BOTH ARE/ WERE DIYers

A FEW WEEKS AGO I WAS TOLD BY MY MOM AND SISTERS THAT IT WAS ALL MINE. IT'S HAD IT'S "BREAK IN" OIL CHANGE AND IS HAS BEEN SITTING AND WAITING FOR IT'S 1ST REAL 3000 MILE OIL CHANGE, WITH ABOUT 500 MILES TO GO

NO MATTER WHAT PEOPLE SAY "NEGATIVELY"----MPG AIN'T AS GREAT, BUT THE EZness OF DIAGNOSING AND REPAIRING SOMETHING OLDER CANNOT BE BEAT!--AIN'T NO COMPUTER, CODES, OR RELATED SENSORS, HAS JUST ONE COIL---STUFF AIN'T COMPLETELY MADE OF PLASTIC. PARTS ARE STILL READILY AVAILABLE, AND NOT REAL EXPENSIVE. WEIGH THAT AGAINST A $30,000+ NEW VEHICLE WHICH WILL MOST LIKELY WIND UP IN AN EXPENSIVE SHOP FOR SERVICE AND REPAIRS UNTIL IT'S LIMITED DISPOSABLE LIFE ENDS

WHAT'S Y'ALLs TAKE ON ALL OF THIS?

THE MEDIC

CJ MEDEVAC
May 8, 2012.
Well it sounds good, but I don't have the time or the money now. I'd wind up being a work in progress. Dropping a new 390 into that old girl has become such a common job that its almost natural now. "Trying" (i aint too good with the fine details of rebuilding a motor, did that to one of the older 390s) to find the time to do all that to my daily driver wont be too easy id need to get another 390 or 352 to work on in the garage over the winter. But I guess its worth a shot. Thanks!

Tiny
BriAN
May 8, 2012.

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