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EFV-8 Club Forum / General Ford Discussion / stromberg 97 power valve

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Discussion Topic: stromberg 97 power valve -- page: 1 2

Stroker

04-20-2012 @ 2:28 PM

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Dave, I once, (and only once)used our dishwasher to clean a Honda Gold Wing motorcycle block after boring and honeing. No harm was done, but I've been reminded by The Wife that this is not acceptable to her on a regular basis.

35ragtop

04-20-2012 @ 1:50 PM

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Yes the frozen valve was a problem i incurred. I resolved this by soaking overnight in ATF (auto transmission fluid) then warmed the housing up with an electic heat gun. I have read that putting in the oven was another method but the smell is a problem (to my wife)
After several "car maintenance Experiments" in her old oven I am now officially banned from the kitchen, - well except for washing the dishes !

40 Coupe

04-20-2012 @ 4:14 AM

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The water damage can freeze the PV in place making it impossible to get out. I had one that the head of the PV broke off but the threads were still in place. Max was able to send it to a machine shop that machined the body out of the threads without damage to the threads and cleaned the seat up.

This message was edited by 40 Coupe on 4-20-12 @ 4:15 AM

35ragtop

04-19-2012 @ 11:27 PM

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Thanks Stroker,
Ive been onto the UK guys today and they can supply all the bits I need. Thanks for the comments on the power valve I will just put a new one in to original specs and see how it goes.
regads
Dave h

Stroker

04-19-2012 @ 1:52 PM

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Dave: Most of the fuss and furor regarding power valves has been generated by
discussions of the vacuum-operated power valves found on 1938-53 Chandler Groves/Ford/Holly carburetors. You are correct in stating that the accelerator
pump plunger pushes down on the valve pin when it reaches maximum stroke. Unless
you have a very badly pitted carburetor body, leakage around the Stromberg power valve usually isn't a problem. If that water and "gunk" has badly degraded the
casting, perhaps you should consider a replacement. I believe the only decent
replacement parts are built by a company in the UK.
Check this link http://www.stromberg-97.com/dealer_network/dealer_network.asp?mp=nwus&n=1#mplist

This message was edited by Stroker on 4-19-12 @ 2:00 PM

35ragtop

04-19-2012 @ 1:03 PM

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Thanks, I am faced with replacing the valve as it had corroded with water (presumably )and gunk laying in the carby.
I have a new valve and used supereals effective method but was concerned about in sealing in place. Because of its location it is difficult to test in position.I will double check the seating. The seat face of the carb could also be pitted (eyesight not so good) I wonder if any sealant could be put on the washer. Also the height of the valve above the seat face could also be an issue - doesnt the pump depress the valve pin when it gets to the bottom?
Dave

Stroker

04-19-2012 @ 11:17 AM

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On a 97, (unlike a 94), the power valve is seldom an issue because it is mechanically operated.
97's are more likely to suffer from too high a float chamber fuel level due to needle & seat issues.

supereal

04-19-2012 @ 10:03 AM

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We are seeing lots of power valve problems due to a change in the design that interferes with the seating with the gasket in the carb body. It has been recommended that the rounded part of the valve shank be machined flat to ensure that the gasket will seal. If it doesn't, both vacuum and fuel leakge will occur. We used to test the valve by placing them between your lips and appling suction. If the diaphragn is intact, it should hold onto your tongue. Not scientific, but effective. We don't usually routinely replace power valves when rebuilding a carb, as the valves in the kits are not always reliable. As long as the diaphragm and spring are not damaged, they last a very long time.

sunflower

04-19-2012 @ 9:19 AM

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The best uncle Max madmax1946@comcast.net>

40 Coupe

04-19-2012 @ 6:56 AM

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I would contact Max Musgrove, he seems to be the expert on 97's and does their warranty work.

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