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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Oliver 1550 w/Holley Dist-bad vacuum advance

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09-07-2019 10:24:43

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Hey all, new here....

I'm sure it's kicking a dead horse, but as stated in the subject, I've got a 1965 Oliver 1550 with the Holley distributor and I noticed last year that she was bogging when I'd accelerate. Initially (as most do) I headed to the carb, which ran good both at idle and full power.....it was the transition that caused it to bog pretty bad. Being a mechanic most of my life, it caused me to ponder and consider the vacuum advance........which upon research was bad. I thought "not a problem, get a new one".....yeah, no.....almost impossible to find. I realize I can have it reman'd but I was curious as to what most of you would do, or have done ?....

Thanks in advance....


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09-08-2019 08:54:41

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to bmac57, 09-07-2019 10:24:43  
Thanks......I'll check them out. Kind of a bummer after spending the money for the Pertronix though.......double the money for the Holley than for the Delco....like $160 vs. $85.
I wonder if the distributor you mentioned is totally mechanical ?...gonna take a look...and thanks for the tip rrlund !....


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09-08-2019 08:39:31

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to bmac57, 09-07-2019 10:24:43  
AgPartsFirst sells a brand new replacement distributor for those to replace a Mallory or Holley for $250. It has the hookup for the tach cable. Just add .com to the name.

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09-08-2019 07:47:27

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to bmac57, 09-07-2019 10:24:43  
Thanks for the replies all....

ziffel, I failed to mention that I converted my distributor over to the Pertronix ignition almost a year ago now. Being a child of the "points generation", and growing up setting them on our family farm tractors, trucks, and cars, I knew the upgrade was a positive one. I did consider pinning the point base (thanks) prior to the electronic ignition but I wanted to do a complete changeover.....ignition, coil, and wires and keep the small level of advance the vaccum provides. The ignition move was a good one, at least on my part....starts much faster and runs smoother.....other than the acceleration stumble I mentioned at the beginning.
Also I did check the mechanical weights as you mentioned, as well as the side to side on the shaft, etc......all seems good. The engine on my tractor was rebuilt when I purchased it back in 2004-05 and it appears (based on wear) that the builder re-did the distributor as well.
I did look into an old Mallory distributor as well as a few Delco numbers. The Mallory needed rebuilding (badly) and the guy wanted $300 as is. The Delco's were extremely scarce and also pricey. As another option, I found a couple of rebuilders who reman the vacuum advance's.....I figured I'd look into them first. Then as a last resort, rebuild it myself....mixing new parts with old from a new (similar) vacuum advance. The biggest problem I see is matching the mounting points on the Holley as well as the bends in the 7 degree arm......to clear the base plate


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09-07-2019 14:02:31

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to bmac57, 09-07-2019 10:24:43  
Mine has a Mallory, no vacuum advance, but I've heard on this forum that the Holleys were problems. Not sure why but many have been replaced with Mallory or Pertronix.

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09-08-2019 06:11:05

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to Mike(NEOhio), 09-07-2019 14:02:31  
I have had several of the Holley Dist.in my shop. The sliding plate that the points are mounted to wears and point setting is all over the place. I have been drilling two small holes thru it and fasten it solidly to the bottom plate. Disconnect the vacuum line and plug. BUT FIRST. Make sure the flyweight advance is still good and the post bushings are still good. The vacuum advance offers very little to the operation of tractor.

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09-08-2019 07:05:26

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 Re: Oliver 1550 w/Holley Dist-bad vacuum advance in reply to ziffel, 09-08-2019 06:11:05  
Just curious. Is the vacuum advance necessary if the distributor is switched to electronic ignition?

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