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10-12-2022, 02:50 PM | #1 |
Not Yet Wild
Join Date: Jul 2014
Posts: 61
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G9 Rebuild Time
Hello.
Engine is out. Took it mostly apart, enough to measure and see the piston walls. Piston wall looks smooth, a little oily, as expected as it burns oil. Diameter measures at 2.887 inches. Thinking that seems like original? Is there a convenient list of gaskets and oem numbers I can access to know what to order? Assuming head, intake, carb, exhaust, crank front and back, also need the carb spacer. Also any good videos or how too’s with torque specs.. Thanks for all the help this far. |
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10-12-2022, 04:23 PM | #2 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G9 Rebuild Time
Download the service manual. It will give you all the info you need.
It also looks like you have/had a blown head gasket. You will also want to measure the cylinder entire bore. These tend to get “bell” shaped towards the lower half so even with new rings it will still smoke and burn oil. |
10-12-2022, 05:13 PM | #3 | |
Not Yet Wild
Join Date: Jul 2014
Posts: 61
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Re: G9 Rebuild Time
Quote:
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10-12-2022, 05:26 PM | #4 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G9 Rebuild Time
If it is indeed bell shaped you will need to have it bored out.
You’ll want to use a bore gauge to measure it and make sure it is both round as well as straight. Cheap man’s method you can use a piston ring and feeler gauge and use the piston to push the ring down to various depths evenly and use feeler gauges to measure the ring end gap. It isn’t nearly as accurate but will give you a ballpark. If there’s more than a couple thou difference between the largest and tightest reading I’d have it machined. Or take it to a machine shop and they’ll usually check it for a few bucks and have a much more accurate measurement. |
10-12-2022, 05:26 PM | #5 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,594
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Re: G9 Rebuild Time
While it is apart I would change the valve seal on the intake valve.
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10-12-2022, 05:59 PM | #6 |
Not Yet Wild
Join Date: Jul 2014
Posts: 61
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Re: G9 Rebuild Time
Thanks guys,
I like the idea of a machine shop measuring the bore, thanks for the idea. I also do plan to tear it all down and replace all gaskets and seals. I did get the Service manual, so I do have all the torque specs, unfortunately it does not mention any OEM part numbers for all the gaskets, seals, and Carb Spacer :( Any line on a good source for all those? This is my first engine overhaul, I'm sure that's obvious... |
10-12-2022, 06:11 PM | #7 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G9 Rebuild Time
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10-12-2022, 06:47 PM | #8 | |
Not Yet Wild
Join Date: Jul 2014
Posts: 61
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Re: G9 Rebuild Time
Quote:
Thanks. What a great resource. |
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10-13-2022, 08:30 AM | #9 |
Not Yet Wild
Join Date: Jul 2014
Posts: 61
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Re: G9 Rebuild Time
Just curious.
The bottom shaft for the clutch and fan has 2 seals. Neither are leaking any fluids. Am I best to bite the bullet and replace the 2 seals or leave well alone? The fan is being stubborn coming off. |
10-13-2022, 08:59 AM | #10 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G9 Rebuild Time
If you are taking the motor apart, I would replace every seal and gasket you can find.
Note there is no valve stem seal on the exhaust valve, only the intake valve. It doesn’t hurt anything to put a seal on the exhaust valve. Also once you look up the part numbers you can order the oem parts from partzilla |
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