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Multi-Cylinder Stationary Gasoline Engines and Power Units

Copper Head Gaskets on Hatz Z790


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  #1  
Old 06-07-2019, 02:43:42 PM
Quickenberger Quickenberger is offline
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Default Copper Head Gaskets on Hatz Z790

I have been chasing an oil leak on a log splitter I built using a Hatz Z790 engine. The oil leak is coming from under the head of a socket head capscrew which requires removing the cylinder sleeves to get at. I've attached a picture with the cylinder sleeves removed and an arrow pointing to the leaky bolt. When I put the cylinders and heads back together the copper head gaskets no longer seal. Any remedies for that since I can't find the head gaskets anymore?

Thanks all!
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Old 06-07-2019, 04:07:54 PM
kwfiggatt kwfiggatt is offline
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Default Re: Copper Head Gaskets on Hatz Z790

Did you anneal the gaskets before reusing them? Heat them up and let them cool? This softens the metal and lets it conform again...

Kevin
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  #3  
Old 06-07-2019, 05:45:14 PM
Quickenberger Quickenberger is offline
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Default Re: Copper Head Gaskets on Hatz Z790

I will try that, but the propane torch I have doesn't heat the whole thing up at once. Would that matter?
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Old 06-07-2019, 06:27:47 PM
cornbinder89 cornbinder89 is offline
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Default Re: Copper Head Gaskets on Hatz Z790

To anneal copper you heat in red hot and quench in oil, just the opposite of steel.
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Old 06-08-2019, 11:53:19 AM
Quickenberger Quickenberger is offline
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Default Re: Copper Head Gaskets on Hatz Z790

Heating uniformly would be difficult with just a propane torch. I pulled the heads and found out the gaskets were installed wrong. I’m not sure there is much I can do with these now.
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Old 06-08-2019, 05:45:39 PM
mihit mihit is offline
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Default Re: Copper Head Gaskets on Hatz Z790

Quote:
Originally Posted by Quickenberger View Post
I will try hat, but the propane torch I have doesn't heat the whole thing up at once. Would that matter?
Not at all, as long as the whole piece gets up past critical temperature to re-establish the "grain boundaries" of the metal particles.

Generally polish it to clean, then hang from a wire. Start the torch at the bottom and heat to visibly red then work your way around it pushing the heat. once it's all been up to temp it doesn't matter with copper if you cool quick or slow, so you can then quench it, or leave it to cool in air.

---------- Post added at 09:45:39 AM ---------- Previous post was at 09:43:28 AM ----------

Quote:
Originally Posted by Quickenberger View Post
I pulled the heads and found out the gaskets were installed wrong. I’m not sure there is much I can do with these now.
I can't really tell from the pics. But I'd definitely have a go at peening them flat and cleaning them up. Copper is pretty forgiving.
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Old 07-26-2019, 04:55:54 PM
pigpen60 pigpen60 is offline
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Default Re: Copper Head Gaskets on Hatz Z790

So you had to pull the heads and jugs to get to the bolt. What did you do put sealant on the threads and retorque?
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Old 07-26-2019, 05:38:54 PM
Hatztech Hatztech is offline
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Default Re: Copper Head Gaskets on Hatz Z790

As far I know head gasket are still available, in fact I purchased 2 top end gasket set recently .

The distributor in Idaho is Power Systems West , phone 208-342-5428.M07 Cylinder head Z 790.16.pdf

If I did it correctly I attached the section relating to the cylinder head on the Z790 so you can have part number if you decide to call.
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Old 08-21-2019, 03:08:04 AM
shane438 shane438 is offline
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Default Re: Copper Head Gaskets on Hatz Z790

You might have to get some copper sheeting and make them from scratch. Lay it flat on the head surface and gently tap it out all over with a rawhide or hard rubber hammer and you will get the pattern imprinted on the copper. From there it's best to go slow and easy cutting out all the excess.
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Old 11-23-2019, 11:45:03 PM
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Motorhead Motorhead is offline
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Default Re: Copper Head Gaskets on Hatz Z790

Check this. The listing covers Z790 but the head gaskets look different. Might be a revision. https://www.ebay.com/itm/Hatz-Z-790-...MAAOSwsBtaLE-P
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