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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Head gasket

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Cat u9 u9

09-13-2012 19:56:04
76.250.157.220



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The number is 17a13054




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Old Magnet

09-14-2012 07:58:42
99.28.160.17



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 Re: Head gasket in reply to Cat u9 u9, 09-13-2012 19:56:04  
That uses the later # 7H9983 head gasket (x2).



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Old Magnet

09-14-2012 08:31:04
99.28.160.17



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 Re: Head gasket in reply to Old Magnet, 09-14-2012 07:58:42  
Got to looking closer at the parts book and there are actually two gaskets per head. a 7H9983 and a 7H1582, the second one is on the cylinder side. Maybe that is the answer to your situation. No reference is made to this in the service manual so I'd recommend checking with Cat on this....sorry I didn't catch it sooner. "just thinking" was on to it.

You still need to do the liner height check as it appears you have been running without the liners being restrained due to the missing gasket.
This post was edited by Old Magnet at 09:01:21 09/14/12.

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Cat u9 u9

09-14-2012 17:09:26
76.250.157.220



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 Re: Head gasket in reply to Old Magnet, 09-14-2012 08:31:04  
Mad dash to cat to get the same gaskets
1S-9397 that's the number on all the gaskets
Today but they don't go over the liner eather But n talking to cat they found some other gasket
They didnt give me the part nub but I got some
Coming Monday I'm thinking of cleaning it up real good an
Putting some clay on top the liner checking it
Out measuring it making some shimm stock
But I don't know thanks

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Bob/Ont

09-15-2012 12:51:28
70.26.63.56



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 Re: Head gasket in reply to Cat u9 u9, 09-14-2012 17:09:26  
NO!!!!!, if the liners are low, machine and shim the seats to get the height right.
About the extra gaskets Pete just mentioned, they are for around the push rods. They should be metal with silicone rubber bonded to them.
Later Bob



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Old Magnet

09-15-2012 16:54:38
76.254.43.34



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 Re: Head gasket in reply to Bob/Ont, 09-15-2012 12:51:28  
Hi Bob,
The 7H9983/4S5755 is a composition gasket that goes on the pushrod side. Only one of these gaskets is used per 2-cylinder head.

The 7H1582/1S9397 goes to the piston side, again only one used per head. Can't tell what the material is but I suspect it is copper.

Seems this gasket was left out?????



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Old Magnet

09-14-2012 17:54:42
76.254.43.34



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 Re: Head gasket in reply to Cat u9 u9, 09-14-2012 17:09:26  
The 7H9983 has been replaced by a 4S5755.
The 7H1582 has been replaced by a 1S9397.

Both are available at Heavyquip or Regal and many other aftermarket suppliers as well as Cat.

Get the right stuff, put it together and be done with it. Cobbling it up is just going to lead to more problems. The 17A is a really good unit if built right.



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