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Author Topic: Building bunks for a log truck.  (Read 2634 times)

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Offline Dave Shepard

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Re: Building bunks for a log truck.
« Reply #20 on: May 21, 2018, 01:25:15 PM »
Speaking of boost, one of the aftercooler hose clamps fell off the hose going to the aftercooler on the DT466 farm truck here. The truck would hardly pull, and would make a weird sneezing, snuffling noise every time you let off the throttle. Put a clamp on the hose and now it pulls hard, and no sneezing, snuffling noises. :D
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Offline Dave Shepard

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Re: Building bunks for a log truck.
« Reply #21 on: May 21, 2018, 01:30:50 PM »
A boost gauge is a great diagnostic tool for both stock and modified diesels. You have to know the spec for your engine, but once you do, you can tell right away if something is amiss. I don know if your engine is computerized, but when the MAP sensor failed in my ISB 5.9, it would not fuel the engine due to not seeing a boost signal. 
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Offline Puffergas

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Re: Building bunks for a log truck.
« Reply #22 on: May 21, 2018, 02:41:37 PM »
The PT pump is not timed to the engine.
Jeff
Somewhere 20 miles south of Lake Erie.

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Offline mike_belben

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Re: Building bunks for a log truck.
« Reply #23 on: May 21, 2018, 04:40:52 PM »
You just broke my brain
Revelation 3:20

Offline Puffergas

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Re: Building bunks for a log truck.
« Reply #24 on: May 21, 2018, 06:31:33 PM »
Strange critter indeed. I think they call it pressure timed but the real timing might be in the injectors like a DD. The pressure controls engine power output. Correct me if I am wrong, anybody!
Jeff
Somewhere 20 miles south of Lake Erie.

GEHL 5624 skid steer, IHC 300 Utility, Timberjack 225D, Burg Bandsaw mill, Steiger Bearcat II

Offline Dave Shepard

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Re: Building bunks for a log truck.
« Reply #25 on: May 21, 2018, 08:05:34 PM »
PT is Pressure Time, and goes back a long time with Cummins. In a way it's sort of a common rail, but as you say, the PT pump controls fuel delivery and the injector controls timing. 
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Offline bushmechanic

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Re: Building bunks for a log truck.
« Reply #26 on: May 21, 2018, 08:50:13 PM »
Been a while since I worked on a PT engine but I'm pretty sure that the camshaft controls the injection timing. All kinds of fun setups with different thickness of gaskets and offset woodruff keys if memory serves me. Barge it doesn't look to hard to repair that truck, I don't think it would be hard to remake those stakes, only a bit of HSS and some plate. 

Offline woodmaker

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Re: Building bunks for a log truck.
« Reply #27 on: May 21, 2018, 09:33:24 PM »
Bushmechanic is correct. Offset keys in the cam gear,different thickness shims under the cam follower covers,even different lash in the injector rocker arm all affect timing in the p-t system. The pump makes the pressure,but the cam times it. I did check the hose to the AFC,and the fitting in the top of the AFC cover but that is as far as i got. I will order some gauges for fuel pressure and boost from surplus center,and will start a new thread when I get them installed. thanks all
franklin q80,builtrite 40,husky 372,sachs dolmar 123, dozers,excavators,loaders,tri-axle dump trucks ,autocar tractor with dump,flatbed and detachable trailers, and 8  f350 diesels

Offline mike_belben

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Re: Building bunks for a log truck.
« Reply #28 on: May 22, 2018, 04:05:51 AM »
Alright im tracking again.  Cam actuates mechanical injectors, like a detroit.
Revelation 3:20


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