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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

broken pistons

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40ford

07-10-2018 11:40:19




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I've used this 8N of mine for several years. Other than tune ups, I have never touched the engine. Lately, after a long run cutting grass, it started making a louod tapping sound. I'd stop and the next time everything was fine. The other day, it got bad so I stopped and decided it was either a rod bearing or something major like that. I pulled the pan and the bearings looked fine. I pulled the head and found that all 4 pistons were broken! Many rings broken - a mess. See the photos. What are those pistons with the strange raised lump on the top? What caused this much damage? And why did it run so good all this time??

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Roger in Iowa

07-12-2018 09:44:40




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
For all four to fail, there has to be some common denominator. Such as low grade fuel, timing, overheating, carb settings,, etc??

Would not think being 4 ring would have anything to due with failure after all these years, if they were four ring???



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Dean

07-11-2018 08:59:38




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
Look for evidence of compression domes contacting cylinder head.

Dean



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40ford

07-11-2018 09:06:20




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 Re: broken pistons in reply to Dean, 07-11-2018 08:59:38  
Not a mark on the head's combustion chambers.



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Roger in Iowa

07-10-2018 15:22:51




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
timing too far advanced causing detonation??

Can you post pictures of the piston tops?



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40ford

07-10-2018 16:59:27




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 Re: broken pistons in reply to Roger in Iowa, 07-10-2018 15:22:51  
Don't think the timing is off. Front distributor and timed on a KR Wilson timing fixture. Never heard any detonation sounds. Who knows. It's an old girl and I've used it a LOT in the 20 years or so I've had it. It owes me nothing. I've got new pistons and rings. If the temp would go below 90 for a few days, I'll get it done. And I'm in New York State!

The photo of a piston top is about typical of what they all look like.

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Roger in Iowa

07-12-2018 12:38:07




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 Re: broken pistons in reply to 40ford, 07-10-2018 16:59:27  
When was the distributor off and timing sent? Recently?



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WayneIA

07-10-2018 14:23:58




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
Are these four ring pistons?



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40ford

07-10-2018 14:34:46




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 Re: broken pistons in reply to WayneIA, 07-10-2018 14:23:58  
Yes. I never used starter fluid and been using non-ethanol hi test for the last few years when it became available in my area. This answers the other comments. Thanks guys.



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WayneIA

07-10-2018 14:50:13




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 Re: broken pistons in reply to 40ford, 07-10-2018 14:34:46  
4 ring pistons have two oil control rings. That is one too many. They run too dry. Three rings on a four ring piston works just fine.



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Roger in Iowa

07-10-2018 13:19:50




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
The raised lump can be high compression pistons that were available from TSC. I had them installed in a 9N direct in the block without sleeves.

Are you running 91 octane fuel? You probably should have been with those pistons.



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agjim

07-11-2018 04:47:49




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 Re: broken pistons in reply to Roger in Iowa, 07-10-2018 13:19:50  
I also have a 2N with high compression pistons running in the block without sleeves. I left the bottom rings off the pistons like WayneIA mentioned. It works fine.
Jim



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JerryCPP(WA)

07-10-2018 12:56:48




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 Re: broken pistons in reply to 40ford, 07-10-2018 11:40:19  
I don't know about the lumps - they may be high altitude/high compression pistons. Starting fluid, if you're not using the premium stuff, will break rings, and once the rings are broken the pistons can also fail.



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