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Petter a problem

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Petter a problem

Post by lofty on Mon Jul 06 2015, 20:16

My Petter A runs really nice till last Friday when it stopped and seems to have lost compression.Checked head gasket lifted barrel and everything looks perfect no broken rings etc. and bore looks ok.Bit stuck as to what to check next and wondered if anybody has any ideas .Thanks Jim . Sad

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Re: Petter a problem

Post by StewartH on Tue Jul 07 2015, 13:55

Valves and valve seats perhaps? if designed to run on leaded fuel the valves can get too hot and the seat becomes worn/ coked etc - a simple method (that costs a cup of fuel) to see if the valves are sitting right is to turn the head upside down and pour some fuel onto the head/ cylinder- with luck the fuel will stay in the head and not leak past the vales - if it does leak then at least you have found one issue to sort out - visually inspecting them may not allow you to see the issue..

the remedy can vary - from simple grinding paste to a little more engineering on the valve seats - but others on the forum may have a better idea of specific issues/ solutions..

Best

Hamish

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Re: Petter a problem

Post by blue cat on Thu Jul 09 2015, 17:49

Petter A was not designed to run on leaded fuel, any type of petrol will suit it fine.

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Re: Petter a problem

Post by StewartH on Fri Jul 10 2015, 08:54

well bang goes my theory Smile

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Re: Petter a problem

Post by Villiers on Fri Jul 10 2015, 15:21

Reckon it's the tappet clearance...

Or lack of....

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Re: Petter a problem

Post by lofty on Fri Jul 17 2015, 09:15

Thanks for all the suggestions and sorry for slow reply ,I have had an unexpected week in hospital.Definitely not the valves or tappet clearance,have checked and all ok.Is there a breather somewhere which could be stuck open?

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Re: Petter a problem

Post by StewartH on Mon Jul 20 2015, 09:12

decompression lever - if it has one? I cant think of anything else...

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Re: Petter a problem

Post by Nixie on Mon Jul 20 2015, 09:27

A blocked breather shouldn't cause the problem. I had the same problem with a friends Wolsley engine the other weekend and it turned out to be the valves.
If the bore,rings and head gasket are ok it can only be the valves. I'd check them out as Hamish suggested and if that doesn't work pop them out and give them a regrind.

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Re: Petter a problem

Post by Woodsman on Tue Jul 21 2015, 09:23

I was going to suggest the decompression lever myself but could not see how it could happen. Having looked at the diagram I suppose that the decompression cam or shaft could have worked loose and be holding the valve open. But there again wouldn't that be obvious with the head off?

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Re: Petter a problem

Post by Nixie on Tue Jul 21 2015, 12:30

I'd still check the valves.

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Re: Petter a problem

Post by kevjhnsn on Fri Jul 24 2015, 01:44

as the other lads say other than that is plug threads or plug leaking out compression or something blocking the airflow into head, sucked up something like clump of grass or even bit off a/your oily rag,easy to find out is turn the engine over in reverse and see if the commpression is back,

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Re: Petter a problem

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