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ever hear that after you change head gasket the engine blows up? #986623 02/21/10 03:48 AM
Joined: Mar 2008
Posts: 28
T
tomr406 Offline OP
Getting the Wheeling Fever
My brother law said that if i just replace the head and gasket the block will throw a rod? I never heard any thing like this. For information on the truck look at my cam broke. I WANT TO SELL A FIGHT THAT WE ARE HAVING.

Thank you
Tom..

From the Off-Road World
Re: ever hear that after you change head gasket the engine blows up? [Re: tomr406] #986624 02/21/10 04:19 AM
Joined: Apr 2000
Posts: 4,230
OOP'S Offline
Roll Me Over
He is full of it!!!!


David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"
Re: ever hear that after you change head gasket the engine blows up? [Re: OOP'S] #986625 02/21/10 04:52 AM
Joined: Mar 2008
Posts: 28
T
tomr406 Offline OP
Getting the Wheeling Fever
LOL

Re: ever hear that after you change head gasket the engine blows up? [Re: tomr406] #986626 02/21/10 05:47 AM
Joined: May 2006
Posts: 457
D
Davepet Offline
Mudrunner
Yeah, the stories are out there, & I'm sure it's even happened to a few folks, but if the bottom end is in decent shape, there's probably not going to be a problem.

Dave

Re: ever hear that after you change head gasket the engine blows up? [Re: tomr406] #986627 02/21/10 03:48 PM
Joined: Dec 2000
Posts: 882
M
missouriman Offline
Rock Warrior
no it will not make it throw a rod.

how ever putting a nice new head and head gasket on a very worn out motor will make you wish you had taken the time to replace the rings.

also one of the biggest mistakes made when replaceing the head gasket is not cleaning out the head bolt holes.

also don't let the block scrapings get into the oil passages or water jacket.

I use a rifle brush and a small copper tube on an air gun for the bolt holes.
I use a shop vac while scraping the top of the block.
after I am done scraping I use it to suck out the water jacket and oil passages.

Re: ever hear that after you change head gasket the engine blows up? [Re: tomr406] #986628 02/22/10 06:08 PM
Joined: Jun 2003
Posts: 3,576
engnbldr Offline
Roll Me Over
*****
Quote
My brother law said that if i just replace the head and gasket the block will throw a rod? I never heard any thing like this. For information on the truck look at my cam broke. I WANT TO SELL A FIGHT THAT WE ARE HAVING.

Thank you
Tom..


>>>*Changing the head gasket would have zero effect on the engine's bottom end, rather than causing a failure it far more likely would keep a failure from happening.

Now what could happen is a severe coolant leak might hydraulic lock a cylinder. This would perhaps bend a rod, in that event then of course the rod could break.

All this would mean is not all of the repairs were done in the first place.

*Easy stuff to check for, run the pistons up to the top, if they come all the way then a rod is not likely damaged.

Of course, if the crankcase is full of what looks like chocolate milk, it just might be a good idea to pull the oil pan if she ran any distance that way....*EB


*Beats the he** outa me!....*LOL**...
Re: ever hear that after you change head gasket the engine blows up? [Re: tomr406] #986629 03/08/10 03:12 AM
Joined: May 2003
Posts: 394
Runner-Man Offline
Mudrunner
I've also heard something like this: If you put a new 'top end' on an old engine, the 'bottom end' won't last.

I think it probably arose because someone took an old engine that needed a full rebuild, and ONLY did head and cam work on it. Then, they run it hard because of the new power that they've got. The engine starts to knock, maybe because they put a much bigger cam in it and head(s) with much bigger valves which let in a lot more fuel and make more power, or probably just because it was going to start knocking soon anyway.

I replaced the head gasket on my 22RE 10 years and 90,000 miles ago when I bought it with a broken timing chain. I just did the head gasket again (and a new head and cam) because of a burned valve. I elected not to mess with the bottom end because it isn't knocking, and the other 3 cylinders (without burned valves) had really good compression.

Hopefully I won't be worrying about it for another 90,000 or so.


'89 4Runner, 22RE. Chevy spring swap, 8,000 lb Warn winch, custom front and rear bumpers, e-locker rear. Saved by Grace.

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