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Valves won't open.

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Old 01-17-2011, 11:26 PM
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Valves won't open.
So, i'm looking at buying A 91.5 Cummins that don't run. The guy says it turns over but the valves don't open. Any idea's? It's A good deal so i'll probably get it anyway, just wondering if its an easy fix.
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Old 01-17-2011, 11:38 PM
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probably the cam or the cam gear broke.
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Old 01-17-2011, 11:43 PM
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Are the adjustment screws even touching the push tubes?
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Old 01-18-2011, 12:51 AM
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Maybe the result of a KDP or Killer case bolt (KCB)?
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Old 01-18-2011, 07:53 AM
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Originally Posted by thrashingcows
Maybe the result of a KDP or Killer case bolt (KCB)?
That's what came to my mind too.
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Old 01-18-2011, 09:06 AM
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Ya, my thought was the KDP too. I've had 3 1st gens and never touched A KDP.If it broke the cam gear and stopped the cam the motor is pretty much junk right?
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Old 01-18-2011, 09:21 AM
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Pretty much, some parts will be good some won't.

Most of the valves and push rods are junk. Injection pump has about a 50/50 shot.
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Old 01-18-2011, 10:45 AM
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Hey that is the truck I've been trying to buy in Vacaville but the owner hasn't gotten back to me...
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Old 01-18-2011, 11:30 AM
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What would cause the ip to be a 50/50 shot? The sudden stop or the gears bending or breaking the shaft?
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Old 01-18-2011, 11:36 AM
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Originally Posted by Onemoparnut
What would cause the ip to be a 50/50 shot? The sudden stop or the gears bending or breaking the shaft?
Depends on how/if the cam got broken. If the KDP broke it then chances are the IP is damaged. Really depends on how stuff broke.
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Old 01-18-2011, 07:30 PM
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cant you twist off the t-cover oil filler to inspect the cam/pump gears?
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Old 01-18-2011, 09:20 PM
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Originally Posted by sooty
cant you twist off the t-cover oil filler to inspect the cam/pump gears?

Yup you can try that. Not the greatest visibility, but might give you a better idea of what's going on inside.
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Old 01-19-2011, 05:27 AM
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Originally Posted by Onemoparnut
What would cause the ip to be a 50/50 shot? The sudden stop or the gears bending or breaking the shaft?
If there was enough force to break the cam, I can easily see the gears pushing on the IP enough to wreck it.
cheers,
Douglas
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