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post #1 of (permalink) Old 10-13-2003, 05:44 PM Thread Starter
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what will eccessive crank end play cause

ive got a 351 windsor that has about 1/2" of crankshaft end play. it idles rough (sounds like it wants to stall)and pops through the exhaust alittle but runs pretty strong w/ plenty of power. i know theres a dozen things that could cause these symptoms and ive adjusted, checked; and/or changed everything i can think of externally . what would this amount of end play do to the operation of the engine?
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post #2 of (permalink) Old 10-14-2003, 07:47 AM
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Re: what will eccessive crank end play cause

Crank end play is normally measured in thousandths of an inch. A half inch of end play means that the bearing shells have been completely worn away and the thrust cheeks are riding on the main bearing saddle, so the crank and block are goners. Also the timing chain is running at an angle so the chain and sprockets are shot, as are the connecting rods because they don't have enough room to move the big end side to side that much.

Do you have a houseboat that needs a mooring anchor?

You probably didn't get any earlier answers because a half inch of end play just doesn't compute.
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post #3 of (permalink) Old 10-14-2003, 10:26 AM
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Re: what will eccessive crank end play cause

1/2" Wow!

Maybe the best test to see if the engine's salvagable is the Floatation" test.

Floatation Test:
Toss it in a large body of water - if it floats it's reusable.

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post #4 of (permalink) Old 10-14-2003, 04:08 PM
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Re: what will eccessive crank end play cause

Rich, are you retired Navy?

One of the programmers I worked with was sitting there at his terminal working and I oveheard him say "Well, time to float test this baby." He explained: He was the Navy equivilant of a heating and air conditioning guy on a destroyer for two tours in Vietnam. If they had something they didn't want to fix, they'd float test it.
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post #5 of (permalink) Old 10-14-2003, 06:25 PM
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Re: what will eccessive crank end play cause

Ive seen crank play that was .090 rip out a camshaft, lifters and it ends up causing wrist pin tweakage and knocking in the lower end, man 1/2 inch, sounds like their is no thrust bearing, 1/2" is impossible .......are you sure?? you will never see a thrust bearing side thicker than 3/16" ....heck maybe the crank has rubbed into the block, sounds like shes a goner! I know VW's can run with alot of crank play, they even wear the cases and run great, i built a stroker 1941cc in my old dune buggy and it had 1/8" of play and the case was shot but she still popped wheelies
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