H3 finally time to fix the o so fun cylinder #5 problem and need some help please

[JonBishop]

ok........ my buddy at work builds Torc trucks an said he'd help me do everything and get the Beast running at its full potential again.....
jus need to know these few things and if you have any thing else i should kno please let me know
(my friend wants to know this stuff, cause i have no clue!!!! haha)
did the head come from the factory warped already? or did the heat cause it to warp?

does anyone know the torque specs?

and anything else i should know?

and im looking at O'reilly autoparts for the gaskets but dont know which ones to get....


any help will be much appreciated

 

[f5moab]

Not sure what model year you are asking about, since you didn't post it.

So, it is hard to answer your questions.

But if the head is warped, then it is just one of those problems that can happen with any engine, and you will need more than a new gasket to repair. A gasket will not repair a warped head. Usually, a new head is needed. And no, most likely they didn't leave the factory with warped heads.

As for how to repair....without the proper tools and I don't mean tools found in your normal tool box, it can be quite a job. You need to remove the timing chain from the cams, to do this you either need a special tool to hold the timing chain to the lower pulley(s), or you need to remove the front cover. To remove the front cover you need to remove the oil pan, to remove the oil pan you need to remove the front axle.

Before we developed a special tool for holding the chain in place with tension against the front cover center bolt, GM paid about 18 hours for repair, after the tool was developed and released to dealers, time was cut to around 8-9 hours.

And all cylinder head bolts are torque to yield, so they cannot be reused. You must use new bolts since the original bolt threads are stretched.

As for torque specs...well cylinder head along is:
Cylinder Head Bolt - 12 First Pass 30 N·m 22 lb ft
Final Pass 155 degrees

Cylinder Head End Bolts - 2 Short First Pass 7 N·m 62 lb in
Final Pass 60 degrees

Cylinder Head End Bolts - 1 Long First Pass 7 ·N.m 62 lb in
Final Pass 120 degrees

 

[JonBishop]

i have a 06 3.5L
my buddy(Craig) has a shop, so he has all the tools needed, an has the tool to hold the timing belt into place, what were thinking of doing is machining the head and dropping it back in, hes a natural gear head an wants to tear it apart an fix it haha
so for bout $250 to get it fixed im all for it, ill go ahead an look into the new head bolts and gaskets tho, thank you for the detailed specs too
if theres anthing else please, im all ears

 

[f5moab]

Well, if you have the head problem that was very prevalent with early 06 heads, it was not a warped head it was elongated intake valve seats, and the head required replacement. I assume your tech buddy did some diagnostics to find the problem such as air leak down, compression, etc.

I only supplied the cylinder head torques. There are many many more that are required. Does your buddy have access to Alldata or another similar repair information service provider?

 

[JonBishop]

im looking at this manual to get but im up in the air bout which to get

http://www.tradebit.com/filedetail.php/142995354-gm-hummer-h3-workshop-repair-service-manual

i jus wanna get it fixed! haha gas is killing me an i jus need to get it all done cuz im pulling my hair out about it

 

[JonBishop]

yes he did all the test of it as well, sorry forgot to answer that one compression on #5 was 80, an the others(1-4) were 120s i believe

 

[alrock]

Bring it to AZ and MaxPF and Crawler will help you drop a 5.3 in there. (Sorry, I'm of no help beyond that)

 

[JonBishop]

lol hell if its free, im there! i want a bigger engine now hahaha