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Old 09-04-2010, 07:28 PM   #1 (permalink)
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Default Epica cylinder head bolts

I am about to do a cylinder head gasket on a 2004 2.5L Epica. I have already bought the gasket set ($300) but I was wondering if I also need to buy a set of head bolts. The TM does not say anything about using new ones but since the torque specs are 15 ft.lb, then 18 ft.lb, then 70deg then another 70 deg it makes me think that these might be torque-to-yield bolts that should not be reused.
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Old 09-19-2010, 11:50 AM   #2 (permalink)
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That's a very good point. I have the whole Verona engine apart, and it looks like the same type of bolt is used on the bottom bed plate.
Are you using Loctite 5900 sealer on the head gasket, or something else? I purchased a tube of 5900 from Motion Industries
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Old 09-19-2010, 05:34 PM   #3 (permalink)
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Default Loctite 5900

I was not able to find the loctite brand so am using the equivalent Permatex gasket maker from my local Canadian Tire store. The liquid gasket is only used on two very specific areas of the head gasket (the two narrow arms that extend out by the timing chain cover). The liquid gasket is used on the timing chain cover and oil pan. I decided that the head bolts were reusable and did so. Am now in process of rebuilding everything so will know in a few days if all is well.

Was very surprised to discover that the sprocket driving the oil pump chain is not keyed to the shaft but is only driven by friction through the timing chain sprocket - guess that is why the pulley bolt has a 300 ft.lb torque spec. None of my mechanic friends had every seen such an arrangement.
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Old 09-19-2010, 07:22 PM   #4 (permalink)
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Quote:
Originally Posted by GlenDeep View Post
The liquid gasket is only used on two very specific areas of the head gasket (the two narrow arms that extend out by the timing chain cover).
Yes, I see that now in the service manual, thanks. But, I remember seeing a thin coating, almost everywhere on the surfaces. I remember it because I needed to clean it all off.
There's a Permatex gasket maker called "the Right Stuff", that I have seen, and I think that's the equivalent? Is that what you are using?
jan

Last edited by jumpinjan; 09-19-2010 at 07:26 PM.
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Old 09-20-2010, 09:24 AM   #5 (permalink)
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My local store doesn't carry the Right Stuff but I suspect that it is perfectly adequate - as long as it states that it is oxygen sensor safe!
I had to scrape that same thin coating from my block (I had the head machined) but that black coating was from the head gasket. If you have the new head gasket you will see that the bottom and top surfaces of the metal gasket have a black coating and this likely adheres to the block and head. Look at the old head gasket and you will see many areas where the black has come off.
The technical manual says to remove the engine in order to do a head gasket. With a lot of scraped knuckles and foul language I have been able to do my head gasket in place.
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Old 12-22-2016, 04:00 PM   #6 (permalink)
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Default Cylinder head

I need to buy the cylinder head bolts of my Chevy Epica 2007. Some of you can tell me about the specification of the bolts (length, diameter, thread and nut head)?
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