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Razkid

Onan 20HP crack in heads?

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Razkid

After removing and cleaning the heads I've noticed what looks like either casting flash or cracks in both heads. Trying to be optimistic, I say they are flash but a friend thinks they are cracks. There is no sign of them on the other side of the heads so if they are cracks, they don't go all the way through. Has anyone else seen these on an Onan 20HP head?

Heads1.jpg

DSCN1145[1].MOV

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boomers_influence

raz

if you list a 170-xxxx cast # i will look at some

of mine.

thank you. boomer

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Razkid

Thanks Boomer. They are 4097E and 4098E

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MalMac

Not a expert  here, but they look some what like flow lines when the heads were poured from molten aluminum. 

Edited by MalMac
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Ed Kennell

Any machine shop should be able to do a dye check for a couple$.

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Razkid
On ‎1‎/‎2‎/‎2017 at 7:08 PM, MalMac said:

Not a expert  here, but they look some what like flow lines when the heads were poured from molten aluminum. 

That's what I am hoping! I don't have a machine shop nearby so I hope Boomer finds the marks on some of the heads he is going to check.

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MalMac

In case the worst and you have to replace them, they do show up on eBay from time to time.

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boomers_influence

raz

i only have 1 pair of the E heads.

no hair lines shown.

i have many other A B C etc and some do show the lines.

i WOULD not worry about it.

thank you. boomer

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Razkid

Thanks for your time and effort Boomer!

22 hours ago, MalMac said:

In case the worst and you have to replace them, they do show up on eBay from time to time.

I had found several pairs for sale on Ebay and A-Z Tractors also has some. Thanks.

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