Cylinder head mismatched
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Cylinder head mismatched
Wrong Head.
I hate being a newbie. This was my first rebuild of an engine. I bought some cylinder heads from a salvage yard. They do not seem to have the exact same bolt pattern for the power steering pump.
One bolt hole (Labled A) is wider than the original and most importantly it does not bottom out. It gives me the feeling that it is a water jacket.
There are threads in the hole but they are very worn. There is also a smaller diameter hole next to hole "A" that is not on my original head
If it isn't a water jacket, I can always fill it with JBWeld then drill and tap it to the correct diameter. The power steering bracket does line up with the hole in question.
Any advice? Is it a water jacket? What should I do?
I hate being a newbie. This was my first rebuild of an engine. I bought some cylinder heads from a salvage yard. They do not seem to have the exact same bolt pattern for the power steering pump.
One bolt hole (Labled A) is wider than the original and most importantly it does not bottom out. It gives me the feeling that it is a water jacket.
There are threads in the hole but they are very worn. There is also a smaller diameter hole next to hole "A" that is not on my original head
If it isn't a water jacket, I can always fill it with JBWeld then drill and tap it to the correct diameter. The power steering bracket does line up with the hole in question.
Any advice? Is it a water jacket? What should I do?
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
That is the back of the head, drivers side, the larger hole "A" if for air injection from the air pump system, the smaller hole is for the bolt that holds the tube/assembly in place. The air tube would run from one head to the other across the back of the motor.
You need to get the right head/s, and for the banks. Them holes are sometimes threaded, if so they can be plugged if your air system is different or eliminated but either way must be used on the right sides or your accessories will not bolt up.
You need to get the right head/s, and for the banks. Them holes are sometimes threaded, if so they can be plugged if your air system is different or eliminated but either way must be used on the right sides or your accessories will not bolt up.
Senior User
Joined: Oct 2003
Posts: 247
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From: KY
In OEM configuration there should be a Y hard line that connects those two ports on the back of the heads together and then connects them to a Large Check Valve. Those ports have to be facing the rear of the engine. On my engine when I rebuilt everything I got rid of all the air injection and Egr so I put plugs in those holes, they were standard Coarse threads if I remember correctly. If you are not going to use the air injection system you need to plug these holes.
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Joined: Jun 2002
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Don't use jb weld if you plan on using a bolt in that hole. Do it right. Summit sells them also and Goodson tool and supply may sell them.
eBay Motors: FORD 302 351W HEAD EMISSION INSERTS PLUGS 5.0L 5.0 5.8 (item 310093710053 end time Nov-16-08 08:51:16 PST)
eBay Motors: FORD 302 351W HEAD EMISSION INSERTS PLUGS 5.0L 5.0 5.8 (item 310093710053 end time Nov-16-08 08:51:16 PST)
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
I missed it in your post you did say it is threaded, they do make a special bolt to plug it with when not used. Large bolt has about a half inch threaded section and has a small taper shoulder like some spark plugs have. The taper fits that small bevel you see there in the head around the hole for a tight seal.
You could just as easily use a regular bolt and a flat washer, brass flat washer would be better, it will leak exhaust from there if you do not plug it right.
Either way you need to move that head to the drivers side.
Get the heads off the same motor at the bone yard? If so you'll have the same problem on the other side. If so just swap the heads to the other banks.
You could just as easily use a regular bolt and a flat washer, brass flat washer would be better, it will leak exhaust from there if you do not plug it right.
Either way you need to move that head to the drivers side.
Get the heads off the same motor at the bone yard? If so you'll have the same problem on the other side. If so just swap the heads to the other banks.
Lead Driver
Joined: Aug 2006
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From: Sand Lake, MI
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Wow thanks for the quick replies and good info! Couple more facts and questions. 1) I do have both heads installed and they both have the similar issue. 2) Is that hole just a straight shot thru the head or does it take input from inside. 3) Those insert posted by TDean look promising. Do you think the inside thread dia will accept my original bolt? 4) Lastly, the heads have already been torqued. The engine has not been started. Do I have to replace the gaskets again? I wish I could go back in time. I would've just bought a complete motor. Though its bee heartwrenching, it has been a good experience.
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Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
No don't pull the heads back off, use a couple of the inserts TDean posted to covert the holes. Plugs em and reduces the bolt/hole size to the size needed for the original accessories to bolt right up.
No, I didn't know they made em, them are some very handy little buggers, I wouldn't have suggested you take the heads back off if I did.
Two if them inserts, one for each side should fix both your issues in one shot quick and easy no problem.
Probably a good thing you put the heads on the way you did, you'd a had one heck of a exhaust leak when you fired it up the first time you'd only be able to "feel" back behind the heads if you hadn't.
Now you have em up right up front where they'll be easy to correct!
I'd put a coat pipe dope on the outside of the inserts before screwing them in, something to seal and protect the threads from exhaust leaks/corrosion.
No, I didn't know they made em, them are some very handy little buggers, I wouldn't have suggested you take the heads back off if I did.
Two if them inserts, one for each side should fix both your issues in one shot quick and easy no problem.
Probably a good thing you put the heads on the way you did, you'd a had one heck of a exhaust leak when you fired it up the first time you'd only be able to "feel" back behind the heads if you hadn't.
Now you have em up right up front where they'll be easy to correct!
I'd put a coat pipe dope on the outside of the inserts before screwing them in, something to seal and protect the threads from exhaust leaks/corrosion.
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danr1: You ain't kiddin' when you said it was a good thing I put them on wrong. I stuck a coat hanger down the tube and it does bottom out at the far end of the head. I would have been livid if I had to fix them on the back side of the motor.
Its funny. So far with this rebuild: If it could go wrong... it did go wrong.
Now when I really screw up, it rewards me. There must be an F250 god lookin' down at me and sayin' "This guys had enough...let's give 'em a break".
Thanks everyone for all the help. This forum rocks.
My wife and kids went to bed early...too much Turkey. I think I'll go back out to the garage, have a bud and see what else I can break.
Its funny. So far with this rebuild: If it could go wrong... it did go wrong.
Now when I really screw up, it rewards me. There must be an F250 god lookin' down at me and sayin' "This guys had enough...let's give 'em a break".
Thanks everyone for all the help. This forum rocks.
My wife and kids went to bed early...too much Turkey. I think I'll go back out to the garage, have a bud and see what else I can break.
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
<i>If it could go wrong... it did go wrong.</i>
Hey there ain't a man/woman here that can say they learned without ever making a mistake.
I been working on vehicles for many many years, still learn or pick up something new just about every time I work on one.
And yea this board, the people here are great, I'm here in one way or another everyday!
Gotta love a ford truck.......
Hey there ain't a man/woman here that can say they learned without ever making a mistake.
I been working on vehicles for many many years, still learn or pick up something new just about every time I work on one.
And yea this board, the people here are great, I'm here in one way or another everyday!
Gotta love a ford truck.......
Post Fiend
Joined: May 2004
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From: Lakewood, Ohio
hell, if i could do that i would have a fleet of hemi vehicles and big block corvettes and a couple more houses and married the blonde in california.
Lead Driver
Joined: Nov 2002
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From: Concord, NC
I do have both heads installed and they both have the similar issue.
Those passages are drilled all the way through the head and are also drilled into the exhaust ports of each cylinder.
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Ready to put in the inserts
Thanks to TDean I found these parts on ebay. Really happy with the seller
eBay Motors: FORD 302 351W HEAD EMISSION INSERTS PLUGS 5.0L 5.0 5.8 (item 310093710053 end time Nov-16-08 08:51:16 PST)
Anyway...how do you think I should install them? Red Loctite, Blue Loctite, Aviation Form-a-Gasket, High Tack????
Also...When I bolt up my accesories, whats to stop this threaded insert from spinning when I bolt is turning? Is it a matter of physics? That the OD cannot turn in conjunction with the ID so it naturally tightens????
eBay Motors: FORD 302 351W HEAD EMISSION INSERTS PLUGS 5.0L 5.0 5.8 (item 310093710053 end time Nov-16-08 08:51:16 PST)
Anyway...how do you think I should install them? Red Loctite, Blue Loctite, Aviation Form-a-Gasket, High Tack????
Also...When I bolt up my accesories, whats to stop this threaded insert from spinning when I bolt is turning? Is it a matter of physics? That the OD cannot turn in conjunction with the ID so it naturally tightens????