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replacing head gasket on 4.9L I-6 1982

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300-6 Freak
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replacing head gasket on 4.9L I-6 1982

Post #1 by 300-6 Freak » Fri Jan 15, 2010 2:50 pm

I need a new HG in the '82. I need to know any tips and/or tricks for replacing it. Also what is teh torque for the head bolts and such thanks.
1982 f-150 4.9L 4 spd Manual. NEW 300, Offy-C with Water heat, New Motorcraft 2100 with 1.14v. EFI Manifolds. AND A SICK OBSESSION WITH OLD RUSTY TRUCKS AND I-6 MOTORS :)

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Re: replacing head gasket on 4.9L I-6 1982

Post #2 by mutt » Fri Jan 15, 2010 8:00 pm

best thing to do here is hit up a few book stores and find a chiltonor Haynes manual covering the 6.
the bolts need to b torqued down in stages, in a certain order, the books have illustrations.
The mating surfaces need to be very clean. A few single edge razorblades will scrape up all sorts of stuff you didnt know was there.
the headbolt holes have to be cleaned out, and the bolt threads wire brushed clean.
A book is your best bet. Nothing like pictures when your doing a job like this....

300-6 Freak
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Re: replacing head gasket on 4.9L I-6 1982

Post #3 by 300-6 Freak » Sun Jan 17, 2010 2:29 pm

already have that book thanks :o
1982 f-150 4.9L 4 spd Manual. NEW 300, Offy-C with Water heat, New Motorcraft 2100 with 1.14v. EFI Manifolds. AND A SICK OBSESSION WITH OLD RUSTY TRUCKS AND I-6 MOTORS :)

Lazy JW
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Re: replacing head gasket on 4.9L I-6 1982

Post #4 by Lazy JW » Sun Jan 17, 2010 11:31 pm

300-6 Freak wrote:already have that book thanks :o

If you open the book it has all of those specs right there.
Joe
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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68coupe200
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Re: replacing head gasket on 4.9L I-6 1982

Post #5 by 68coupe200 » Mon Jan 18, 2010 1:38 am

Not to hijack, but I currently have my engine apart. I was getting some "milkshake" on the dipstick and the oil fill cap. Once i got the head off, the gasket still looked decent. The head has no obvious cracks or anything, but the valves do hang down a little into the combustion chamber, like they are still slightly open.

Not sure what to make of it. But i'm swapping on a different head and gasket, and hope it fixes my issue.
83 F150 2wd: Clifford 4bbl intake, Holley 4160, EFI long-reach plugs, EFI exhaust.
3.55 Axle swap coming soon...

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Re: replacing head gasket on 4.9L I-6 1982

Post #6 by Harte3 » Mon Jan 18, 2010 9:54 am

If you are getting the "milk shake/yogurt" condition on the dip stick and breather/oil filler cap this is usually caused by cold starts and short trips...not enough running at operating temperature to cook off the condensation that can build up.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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THE FRENCHTOWN FLYER
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Re: replacing head gasket on 4.9L I-6 1982

Post #7 by THE FRENCHTOWN FLYER » Mon Jan 18, 2010 10:05 am

68coupe200 wrote:... but the valves do hang down a little into the combustion chamber, like they are still slightly open.
Not sure what to make of it. But i'm swapping on a different head and gasket, and hope it fixes my issue.

Squirt a few tablespoons of mineral spirits in each port. If it runs out the valve seats the head needs reconditioning. A little seepage fromthe valve seat over a minute is OK to put back in service if you are on a budget.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

300-6 Freak
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Re: replacing head gasket on 4.9L I-6 1982

Post #8 by 300-6 Freak » Mon Jan 18, 2010 11:01 am

Lazy JW wrote:
300-6 Freak wrote:already have that book thanks :o

If you open the book it has all of those specs right there.
Joe




I know that I just cant find the book since moving. Sorry just being lazy figured someoen here would be able to rattle them off thats all :beer:
1982 f-150 4.9L 4 spd Manual. NEW 300, Offy-C with Water heat, New Motorcraft 2100 with 1.14v. EFI Manifolds. AND A SICK OBSESSION WITH OLD RUSTY TRUCKS AND I-6 MOTORS :)

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Re: replacing head gasket on 4.9L I-6 1982

Post #9 by 68coupe200 » Mon Jan 18, 2010 3:09 pm

Harte3 wrote:If you are getting the "milk shake/yogurt" condition on the dip stick and breather/oil filler cap this is usually caused by cold starts and short trips...not enough running at operating temperature to cook off the condensation that can build up.


That's what I was thinking too. But the milkshake persists no matter how long I drive. This is a real head scratcher. :?: Can't for the life of me figure it out, so thats why i pulled my head. Waiting on my new gaskets to come back in so I can install the "new" head. Was having some weird running issues, and using oil as well with no blowby. Hopefully this fixes it.
83 F150 2wd: Clifford 4bbl intake, Holley 4160, EFI long-reach plugs, EFI exhaust.
3.55 Axle swap coming soon...

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Re: replacing head gasket on 4.9L I-6 1982

Post #10 by mutt » Mon Jan 18, 2010 5:26 pm

PCV working properly?

68coupe200
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Re: replacing head gasket on 4.9L I-6 1982

Post #11 by 68coupe200 » Mon Jan 18, 2010 6:35 pm

I've replaced the pcv valve just about every two oil changes. I know "new" does not really mean "good" as we've all had new parts crap out straight out of the box. Unless i've gotten several bad ones straight in a row I don't think that the pcv is the issue.

Still can't explain the "milkshake" on the dipstick and fill cap. I'm going to try the mineral spirits trick and see if any will leak past the valves on the old head. Maybe its just sucking the oil from the rocker/valvespring area into the combustion chamber? Though I figured with the way its going through oil, it should smoke...which it doesn't.

Argh!! :hmmm: :?:
83 F150 2wd: Clifford 4bbl intake, Holley 4160, EFI long-reach plugs, EFI exhaust.
3.55 Axle swap coming soon...

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Re: replacing head gasket on 4.9L I-6 1982

Post #12 by 68coupe200 » Wed Jan 20, 2010 6:33 pm

New head and head gasket installed. Fired right up on the 3rd rotation, and idles great! I haven't had a chance to road test it yet as I just got finished about 35 minutes ago. Going to give it a trial by fire in a little bit, take it for a good long run to a friends house and back.

I appreciate all the info and help guys. The valves in the other head were allowing oil to get past them, as when i poured some mineral spirits on the springs and it leaked right through.
83 F150 2wd: Clifford 4bbl intake, Holley 4160, EFI long-reach plugs, EFI exhaust.
3.55 Axle swap coming soon...

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Re: replacing head gasket on 4.9L I-6 1982

Post #13 by 300-6 Freak » Thu Jan 21, 2010 11:49 am

68coupe200 thats awesome. Mine is ideling good now and I found the vacuum leak. The intake and exhaust manifold gaskets wont seal tight. I'm hoping this will stop after a few days of actually driving ti around
1982 f-150 4.9L 4 spd Manual. NEW 300, Offy-C with Water heat, New Motorcraft 2100 with 1.14v. EFI Manifolds. AND A SICK OBSESSION WITH OLD RUSTY TRUCKS AND I-6 MOTORS :)

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