352 Knock
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352 Knock
I bought a 67 F250 4x4,it had been sitting 7 or 8 yrs.I did the basics to get it started and it started easy.But ther is a knock.I pulled the pan and checked the bearings,they are worn cooper showing.I pushed the pistons up checked the cylinder walls scars,but all looked good for it age.Could the knock be stuck rings?I'm tempted too put new bearing in it and put some WD40 throu the spark plug holes let it sit for a few days and start it and just let it warm up real good.I would like to know what everbody thinks about this idea or is just a hair brain idea Thanks
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
Depends on how you intend to use the truck and what your budget is. If you are just looking for a run-around vehicle or something to play with, change the bearings while pan is off and have some fun (I did this for two years). If you want a serious bullet proof performer, you have some work ahead of you...
Welcome aboard! --Mike
Welcome aboard! --Mike
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
I doubt the rings are the cause of the knock. More likely the worn out bearings, could be wrist pins-to-pistons. Could be a few other could-be's.
The bugger about the knocking sound is that by the time you hear it, something is now hammering away. That's how things like rod ends get bent out of shape, holes get wallowed out etc. The question is wether or not it can still hold a new bearing in place well enough to run. If you can afford to throw away a set of bearings, and don't really need to rely on the truck; I'm with Mike G, have some fun.
FWIW, I like ATF in the spark plug holes: It's not a solvent it's an oil; you maintain some lubricity. It penetrates tight clearances and loosens old deposits. However, it will not directly improve your sex life. LOL
Have fun, Mike
The bugger about the knocking sound is that by the time you hear it, something is now hammering away. That's how things like rod ends get bent out of shape, holes get wallowed out etc. The question is wether or not it can still hold a new bearing in place well enough to run. If you can afford to throw away a set of bearings, and don't really need to rely on the truck; I'm with Mike G, have some fun.
FWIW, I like ATF in the spark plug holes: It's not a solvent it's an oil; you maintain some lubricity. It penetrates tight clearances and loosens old deposits. However, it will not directly improve your sex life. LOL
Have fun, Mike
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
I had a '63 bird 390 that spun the rearmost main bearing. Drooled oil all over the SMOG inspection station so much the guy said "don't ever come back with this thing". It was as quiet as if it had new bearings....... But they were all well into the 'copper' color.
I replace them all, and put it back together. Quit pouring oil out the rear seal.
How is it possible that it didn't ruin the crankshaft journal I don't know, but it seemed fine, and had no scoring or other marks. So, these beasts are strong, and can stand a lot of abuse.
You can get a 'HELP' brand bearing pusher at an auto parts store, or you can form your own using a shortened nail of approximate diameter. Your choice.
I would not buy the best bearings for this type of replacement, though a full set is not that expensive. Just the oil dripping in your face all the time.
tom
I replace them all, and put it back together. Quit pouring oil out the rear seal.
How is it possible that it didn't ruin the crankshaft journal I don't know, but it seemed fine, and had no scoring or other marks. So, these beasts are strong, and can stand a lot of abuse.
You can get a 'HELP' brand bearing pusher at an auto parts store, or you can form your own using a shortened nail of approximate diameter. Your choice.
I would not buy the best bearings for this type of replacement, though a full set is not that expensive. Just the oil dripping in your face all the time.
tom
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