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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics> Unable to separate head from block due to head gasket sealer
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Topic Review (Newest First)
02-02-2011 01:12 PM
Nostalgia
success @ separating the head from the block

The problem was gasket sealant and 14 studs.
I used air pressure through the spark plug holes, and was able to verify the head was loosened. This also partially separated the gasket from the head, and with a little perseverance, the hoist was able to pull it off.

1st time I've used the forum, and want to thank you all for the help.
02-02-2011 11:28 AM
1971BB427 Because you've got a chain or belt that attaches the cam to the crank. If you remove that it wont open and close the valves and the piston may hit the valves. If you leave it hooked up it may damage the head, sprocket or belt when it comes loose.
You could pull the rocker arm ***. and the cam belt, and then do it, but that's the only way to do so with an OHC engine.
02-02-2011 11:20 AM
Blazin72
Quote:
Originally Posted by 1971BB427
I've used the cranking engine (with plugs in the head!) often, but if this is an overhead cam engine it should not be done. It only works with engines that have the cam located in the block.
Why couldn't it be done on an OHC engine?
02-02-2011 09:54 AM
jeffery wells wow, talk about a stubborn head, i to have done used the handle of a hammer, it was on a lawn mower, but still. DON'T USE ANYTHING THAT WILL DAMAGE THE HEADS, make sure the tool you are using is softer then what you are prying on, learned that one the hard way and had to get new heads.
02-02-2011 09:18 AM
MARTINSR How about a cast iron flathead with studs instead of bolts, my Rambler was a challenge!

I bolted a chain to the intake studs and used the cherry picker.

Brian
02-02-2011 08:20 AM
1971BB427 I've used the cranking engine (with plugs in the head!) often, but if this is an overhead cam engine it should not be done. It only works with engines that have the cam located in the block.
02-01-2011 10:13 PM
h0trod389
Quote:
Originally Posted by CJ_1080
Never thought of that, that's a good one! I've had a few heads be complete boogers. Usually because the tractor or motor I'm working on hasn't moved in 40 + years.

when i was a wee lad, i remember my pops doing this on his ford I-6's talked to him today and asked what he used, turns out he defiled a sparkplug, tapped a hose fitting into it and hooked the air up that way, he says he still has it and he said he would give it to me, dont really need it, but it would be a nice convo piece.
02-01-2011 06:25 PM
curtis73 I was able to get mine off an old Pontiac 6 by cranking it over. The valves were closed, but the pressure had equalized in the three cylinders in the down position and the rising pressure lifted it right off. I might have someone holding the head in case it decides to pop off the pins.
02-01-2011 06:13 PM
Blazin72
Quote:
Originally Posted by CJ_1080
Never thought of that, that's a good one! I've had a few heads be complete boogers. Usually because the tractor or motor I'm working on hasn't moved in 40 + years.
If you do that make sure you do as somebody else mentioned and loosely screw in a couple head bolts. You don't want the head popping free in an uncontrolled fashion. It would probably also be best to make sure the cylinder you pressurize is at BDC.
02-01-2011 06:10 PM
LATECH What is the head on ? what kind of engine?
02-01-2011 06:07 PM
CJ_1080
Quote:
Originally Posted by h0trod389
if i were you, id try using a leak down tester!!!!
fill one of the end cylinders with air pressure, make sure the valves are closed. 100 psi @ least.

then try prying the head off again.
Never thought of that, that's a good one! I've had a few heads be complete boogers. Usually because the tractor or motor I'm working on hasn't moved in 40 + years.
02-01-2011 04:07 PM
lmsport In old Triumph/Austin manuals, they recommended loosening all the head bolts a few turns, then turning the key in order to pop the head loose with combustion pressure. I saw my Dad do this a few times.
02-01-2011 03:01 PM
DanielC Pay close attention for any other bolts. Some engines have bolts on the ends that are not head bolts, but are there to help seal oil, or water passages. Very common on ohc engines.
02-01-2011 01:35 PM
cobalt327 It does sound like a bolt may still be in it.

Last resort- Put the plugs back in it and spin the engine over w/the starter. Thread some head bolts back in finger tight so the head doesn't pop off.
02-01-2011 01:22 PM
T-bucket23 Gasket sealer should not over power a 3' bar. Double check for bolts. Sometimes they are hidden in the corner or between valves. If you check a torque sequence chart it should identify where all the bolts should be.
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