239 Fuel Pump Drive
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Tuned
Joined: Nov 2017
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From: Cicero, IN
239 Fuel Pump Drive
I believe that the fuel pump push rod is driven off of the rear of the cam shaft. How many strokes does the push rod make for every revolution of the camshaft? How is the push rod retained? Can it be lifted out when the fuel pump and the mounting adapter are removed? Is the push rod located by a bushing in the block?
Fleet Owner
Joined: Jul 2004
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From: NM
The pushrod runs on an eccentric on the camshaft, it makes one cycle for each revolution of the camshaft. Lift is only 0.200". It runs fairly loosely thru a bushing in the oil gallery. You can remove the pushrod if you pull the fuel pump stand off (make sure you keep track of which end rides on the cam). The pushrod just lifts out, no retainer.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
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From: Bothell & Silverdale, WA
I believe that the fuel pump push rod is driven off of the rear of the cam shaft. How many strokes does the push rod make for every revolution of the camshaft? How is the push rod retained? Can it be lifted out when the fuel pump and the mounting adapter are removed? Is the push rod located by a bushing in the block?
Retained by bore in block casting, no bushing iirc, lifts right out after interferences are removed.
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Tuned
Joined: Nov 2017
Posts: 302
Likes: 44
From: Cicero, IN
The cam has a single eccentric lobe on the end, so one full stroke per cam revolution, BUT the pump operates on the upstroke AND the downstroke. Since the cam runs at half engine speed, this in effect gives a complete pump throughput cycle per engine revolution.
Retained by bore in block casting, no bushing iirc, lifts right out after interferences are removed.
Retained by bore in block casting, no bushing iirc, lifts right out after interferences are removed.
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