head bolt ?????'s
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Senior User
Joined: Jan 2008
Posts: 219
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From: Southern IL
head bolt ?????'s
Im rebuilding a 351w motor from a 92 truck. Chiltons manual doesnt say anything about applying oil or sealant or lock tite to any head bolts. Ive put enough bolts in things before to know that you always put something on them, what is reccommend?
More Turbo
Joined: Jan 2008
Posts: 679
Likes: 2
From: Vancouver B.C.
I just looked up the repair procedure using ALLDATA and it says nothing either... mabe nothing is to be used. I do know that using a bottoming tap to clean the threads is allways a good idea. And I would think that a light oil should be used but I'm not sure...
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
it doesnt?
IF the bolts extend into the cooling jackets you MUST use PST (or equivalent) or elee they will leak. A little motor oil dunk for the others to keep them from galling
and under the heads, use a bit of sealant - the reason being it lubes the head (no that is not pornographic) so when you torque it, it does not stick and give a false reading.
It really said to use nothing?
IF the bolts extend into the cooling jackets you MUST use PST (or equivalent) or elee they will leak. A little motor oil dunk for the others to keep them from galling
and under the heads, use a bit of sealant - the reason being it lubes the head (no that is not pornographic) so when you torque it, it does not stick and give a false reading.
It really said to use nothing?
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
looked in my ford service manual, twice.
can't find anything that says to do anything except torque.
edit: i am going through he service manual. page by page, i found that the 300 six section says to coat threads of bolts with engine oil.
still looking for v8's.
edit: it only says to do this:
1. clean the cyl head
2. do not apply sealer to composition gasket.
3. cyl heads are tightened in 2 steps for 5.8 3 steps for 5.0
5.8: all bolts to 95-105 lb-ft
all bolts to 105-112 lb-ft
5.0: 24-35 ft-lb
45-66
turn all bolts in sequence an additional 85-95 degrees.
sequence is
9 5 1 3 7
10 6 2 4 8
no mention of oil on bolts.
i hope this helps.
i am trying to watch usa basketball win a gold metal so i hope i got this straight.
can't find anything that says to do anything except torque.
edit: i am going through he service manual. page by page, i found that the 300 six section says to coat threads of bolts with engine oil.
still looking for v8's.
edit: it only says to do this:
1. clean the cyl head
2. do not apply sealer to composition gasket.
3. cyl heads are tightened in 2 steps for 5.8 3 steps for 5.0
5.8: all bolts to 95-105 lb-ft
all bolts to 105-112 lb-ft
5.0: 24-35 ft-lb
45-66
turn all bolts in sequence an additional 85-95 degrees.
sequence is
9 5 1 3 7
10 6 2 4 8
no mention of oil on bolts.
i hope this helps.
i am trying to watch usa basketball win a gold metal so i hope i got this straight.
Senior User
Joined: Mar 2005
Posts: 341
Likes: 0
From: Newark
it doesnt?
IF the bolts extend into the cooling jackets you MUST use PST (or equivalent) or elee they will leak. A little motor oil dunk for the others to keep them from galling
and under the heads, use a bit of sealant - the reason being it lubes the head (no that is not pornographic) so when you torque it, it does not stick and give a false reading.
IF the bolts extend into the cooling jackets you MUST use PST (or equivalent) or elee they will leak. A little motor oil dunk for the others to keep them from galling
and under the heads, use a bit of sealant - the reason being it lubes the head (no that is not pornographic) so when you torque it, it does not stick and give a false reading.
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Post Fiend
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From: Lakewood, Ohio
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It's always a good idea to put some sealant on the lower(outside) head bolts as they go right into the water jacket. The inside bolt holes are blind so these should get oil. Other bolts that should get sealant are the water pump bolts around the outlets in the block, and the flywheel/flexplate bolts in the crank, these too go all the way through and can be a source of leaks.
The "How to rebuild small block Fords" paperback I have mentions what all these bolts should get as far as sealant and lubrication.
Only those blocks with torque to yield head bolts require new ones when the heads are removed, and I don't believe any of the small lock motors used these.
The "How to rebuild small block Fords" paperback I have mentions what all these bolts should get as far as sealant and lubrication.
Only those blocks with torque to yield head bolts require new ones when the heads are removed, and I don't believe any of the small lock motors used these.
Thread Starter
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Senior User
Joined: Jan 2008
Posts: 219
Likes: 0
From: Southern IL
My bolts seem to be in great shape and not rusty at all, actually black as the day they were new. I think i might put sealer around on the threads just to be sure. I dont think it would hurt anything anyhow. Im not sure what id do if it werent for you guys. I know my wife would go nuts
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
It's always a good idea to put some sealant on the lower(outside) head bolts as they go right into the water jacket. The inside bolt holes are blind so these should get oil. Other bolts that should get sealant are the water pump bolts around the outlets in the block, and the flywheel/flexplate bolts in the crank, these too go all the way through and can be a source of leaks.
The "How to rebuild small block Fords" paperback I have mentions what all these bolts should get as far as sealant and lubrication.
Only those blocks with torque to yield head bolts require new ones when the heads are removed, and I don't believe any of the small lock motors used these.
The "How to rebuild small block Fords" paperback I have mentions what all these bolts should get as far as sealant and lubrication.
Only those blocks with torque to yield head bolts require new ones when the heads are removed, and I don't believe any of the small lock motors used these.
FYI - bolts that use an angle gauge after max torque are 'TTY' (torque to yeild) bolts. use them - replace them - old ford bolts IIRC are not TTY and the stuff you can get thru summit are not ttys (unless specified)
the 'yield' is 1/4th of one thread of whatever thread count you have (i.e. 16TPI = .25 * .0625), expressed in thous)
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