Need Prestolite pump help
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Need Prestolite pump help
I am restoring a 76 cig 28ss and am having a problem with the trim sytstem. the drives will trim up/out normally, together and sound fine. the problem is trimming in / down. the pumps sound like they are under heavy load and the drives are moving very slowly. I never ran the system before the restoration so I dont know if this is what they were like before. I feel like it is a valving / pump issue. I checked the pressure on the up and down side and they are to specs at I believe 2200psi up and 600 psi down.
the only other thing I think could be a problem is that I have 2 cylinders with solid pistons and 2 with valving. I installed them 1 and 1 on pt and stbd.
any insight into this would be greatly appreciated.
thanks guys
Chris
the only other thing I think could be a problem is that I have 2 cylinders with solid pistons and 2 with valving. I installed them 1 and 1 on pt and stbd.
any insight into this would be greatly appreciated.
thanks guys
Chris
#2
Lakeside Restorations.com
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Are you running the same size diameter lines on the down side? If not you could be restricting the volume...
There are also newer pumps & rams that will move up & down faster.. However yours should be about the same speed both ways amd if anything many times the drives go down a little faster as gravity or load usually is an assist..
J
There are also newer pumps & rams that will move up & down faster.. However yours should be about the same speed both ways amd if anything many times the drives go down a little faster as gravity or load usually is an assist..
J
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#3
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Very common for the shock valves to come apart inside the cylinders.
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#4
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I had everything apart - cleaned and reassembled - so there is no "mechanical" issue with what I have. both sides have the same size lines.
I think there may be a mismatch problem?
doe anyone know the reason for having solid and valves pistons? and do they serv any function other than overpressure relief?
I have also seen other prestolite pumps with different pump/ valve housings is there a difference?
Thanks for your help
Chris
I think there may be a mismatch problem?
doe anyone know the reason for having solid and valves pistons? and do they serv any function other than overpressure relief?
I have also seen other prestolite pumps with different pump/ valve housings is there a difference?
Thanks for your help
Chris
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