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01-16-2021, 07:14 PM | #1 |
Not Yet Wild
Join Date: Jan 2021
Posts: 3
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G2 excessive blow by
Before I tear my engine apart to replace piston rings etc,is there any thing I'm overlooking that would cause excessive blow by ? At high RPMs the
pressure will blow the oil filler cap off. I have never worked on these engines before. |
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01-17-2021, 10:08 AM | #2 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: G2 excessive blow by
I don't know if you're missing anything or not, but you're right....it's not supposed to blow the oil cap off. That's a lot of back pressure. Did you check your pcv?
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01-17-2021, 10:43 AM | #3 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G2 excessive blow by
Just to throw it out there, I had that happen a few times. Clean the rubber cap and the inlet tube with some brake cleaner. The oil makes it slippery and not stick in there securely like it should. There’s also a chance it’s just a 30 year old rubber cap that’s seen better days.
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01-17-2021, 08:27 PM | #4 | |
Searching for The Way
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Location: Medina, Ohio (NEOHIO)
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Re: G2 excessive blow by
Quote:
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01-19-2021, 08:36 PM | #5 |
Not Yet Wild
Join Date: Jan 2021
Posts: 3
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Re: G2 excessive blow by
Thank you. I will make sure my oil cap is clean and dry, that should help. How do you do a leak down test?
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01-19-2021, 09:01 PM | #6 |
Getting Wild
Join Date: Jul 2020
Posts: 75
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Re: G2 excessive blow by
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01-19-2021, 09:58 PM | #7 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
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Re: G2 excessive blow by
Check out some YouTube videos, it's super easy. Just make sure you use a decent tester. I've had some Harbor Freight compression testers and they were junk, so I can't recommend those. I have used the "OTC" brand and it seems decent for the price.
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01-19-2021, 10:09 PM | #8 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: G2 excessive blow by
Maybe one of these days I’ll have to get a real tool but my blow tip has a rubber cap on the end. I just wedge that in the spark plug hole and squeeze the trigger. Then listen for the hiss
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01-19-2021, 10:14 PM | #9 |
Searching for The Way
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Location: Medina, Ohio (NEOHIO)
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Re: G2 excessive blow by
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01-20-2021, 09:10 PM | #10 |
Not Yet Wild
Join Date: Jan 2021
Posts: 3
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Re: G2 excessive blow by
Thanks for your help. Need to find a good compression tester now.
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