Air Cooled Engine overheating!

[Nick Connell]

Hi guys,

 

I have got an air cooled Hatz engine which powers my Jensen chipper. It has a problem over heating at the moment so that when I've used it for a while the starter motor expands and won't start. It's burning a bit of oil too.

 

When its cold starts no problem. Have checked the oil cooler to see if it was blocked and its clean and the fan works.

 

Any Ideas?

 

 

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[monkeybusiness]

Are the blades/anvil blunt?

[geoff]

Tired engines get hot, if it's burning oil, etc, sounds like it could do with a refresh on the top end.

[Nick Connell]

Refresh on the top end? Is that new piston rings?

 

 

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[Nick Connell]

Will give the blades a sharpen and see if it helps

 

 

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[treequip]

Have you cleaned the oil cooler?

 

You will find it conveniently buried in the bottom of the engine under the covers.

 

Situated where they are the get overlooked, most operators don't even know it's there.

 

Clean it out and see if that cures the problem.

[geoff]

As Treequip says, if not a top end refresh can be anything from new rings & bore hone, to rebore & valve lap, replacement, but check the external stuff before spending money.

[PeteB]

Air cooled engines have fins on each barrel, check these for cleanliness, and make sure that the covers encourage air pulled in by the fan goes in the right direction!

[PeteB]

I have got an air cooled Hatz engine which powers my Jensen chipper. It has a problem over heating at the moment so that when I've used it for a while the starter motor expands and won't start. It's burning a bit of oil too.

 

When its cold starts no problem. Have checked the oil cooler to see if it was blocked and its clean and the fan works.

 

Sent from my iPhone using Arbtalk

 

Sorry, re-read this "it gets so hot that it stops and the starter cannot turn it over, " - is that right?!! It is seized when hot!?! Hmm, sounds terminal to me, oil starvation more than cooling issues....

[openspaceman]

 

Sorry, re-read this "it gets so hot that it stops and the starter cannot turn it over, " - is that right?!! It is seized when hot!?! Hmm, sounds terminal to me, oil starvation more than cooling issues....

 

Or temperature sensor (on cylinder 1 head on 4 cylinder models) inhibits starter??