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Petters PH1

Talk about technical issues here. Questions and answers!

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mechman
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Petters PH1

Post #1 by mechman » Thu Jul 13, 2017 12:29 am

Hi guys.
Got a Ph1 it runs sweet as a nut ( after De coke etc) but can't get a slow tick over on it. tried adjusting linkages etc to no avail. Could it be weak governor springs?
Norm. :dizzy:


Jeremy Rowland
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Re: Petters PH1

Post #2 by Jeremy Rowland » Thu Jul 13, 2017 7:28 am

Hi Norman I am not sure of the setup on these but have you completely disconnected the throttle linkage to see if it will tick-over then? Did it tick-over okay before any work you carried out?

Jeremy


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Re: Petters PH1

Post #3 by mechman » Thu Jul 13, 2017 4:53 pm

Hi Jeremy
Yes loosened every thing off , no difference, but if you touch the governor arm the engine settles down immediately, that's what makes me think the governor springs are maybe weak or broken, there's little resistance when you press against the governor arm. The tick over has been hitty missy for a while.
Norm.
PS. Hope this gets thru its taken an hour. IT provider is crap


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Re: Petters PH1

Post #4 by Jeremy Rowland » Fri Jul 14, 2017 7:22 am

mechman wrote:Hi Jeremy
Yes loosened every thing off , no difference, but if you touch the governor arm the engine settles down immediately, that's what makes me think the governor springs are maybe weak or broken, there's little resistance when you press against the governor arm. The tick over has been hitty missy for a while.
Norm.
PS. Hope this gets thru its taken an hour. IT provider is crap



Yes Norman it does sound like the governor springs but I have no idea where you would get some or just how difficult a job it is to do? Is there a fuel injection pump specialist in your area that you could drop the pump into them and get them to do it?

Jeremy


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mechman
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Re: Petters PH1

Post #5 by mechman » Fri Jul 14, 2017 9:56 pm

Hi Jeremy
The springs are quite a straight forward job just very time consuming, they are fitted to the end of the camshaft separate from the pump.
Norm.


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Re: Petters PH1

Post #6 by Jeremy Rowland » Sat Jul 15, 2017 9:33 pm

mechman wrote:Hi Jeremy
The springs are quite a straight forward job just very time consuming, they are fitted to the end of the camshaft separate from the pump.
Norm.


Norman I get them replaced then hopefully that should sort it; plenty of spring manufacturers around if you can't get originals.

Jeremy

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Re: Petters PH1

Post #7 by FOWLER MAN » Sun Jul 16, 2017 3:20 am

Hi Norman,
I haven't posted here for some time but I thought I may be of help here.
I worked on many of these engines in the 1960s and 70s
Don't waste your time looking to change the governor springs. If they were weak it would cause the engine to rev, but it's important to understand how the governor works to set it up.
The centrifugal governor forces are kept in check by the two governor weight springs, and these are balanced by the speeder spring tension which acts against them.
The springs on the weights are non adjustable but the system is kept in balance by tensioning the speeder spring at the injector pump end of the linkage.
If the governor springs are weak adjustment of the speeder spring will compensate for the weakness anyway.
I have had a similar problem to yours on occasion and it has always been the push rod which goes through the camshaft linking the weights to the fulcrum arm on the flywheel end,( the top end of which connects to the pump rack).
This rod sticks after long service and needs both the bore and rod cleaned to free it off.
The push rod will be in two parts with a ball bearing between them . The ball bearing is there to prevent the short end of the rod turning and wearing the fulcrum arm.
You don't have to remove the cam shaft to do this.
I hope this helps.
Fred


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Re: Petters PH1

Post #8 by Jeremy Rowland » Sun Jul 16, 2017 8:39 am

Thanks Fred :thumbup: you can't beat experience :bow: Fred please judge the last photo comp next before the end of July :thumbup:

Jeremy


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mechman
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Re: Petters PH1

Post #9 by mechman » Mon Jul 17, 2017 12:30 pm

Thanks for the info fred
Norm


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