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Old 05-27-2005, 01:51 PM   #1 (permalink)
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Perkins idle problem

Howdy,
I have a Perkins 6.354 in my 73 F250. It was running pretty well until I intalled a new injector pump. Actually, it ran much better after the new injector pump: easier starting, less smoke, more boost... except for this: after driving around for a bit it starts idling rough. Maybe the new pump is not at fault, it could just be a coincidence. I have been suspecting air in the fuel and today I installed a piece of clear hose on the return line. The returning fuel does not look aerated though this doesn't rule out air bubbles in the inlet fuel. I'll install a clear section in the pickup soon, but I'm getting pretty frustrated. This new pump is so much better than the old one in all other respects that I really don't want to put the old one back in.
Any Perkins or Lucas/CAV experts out there?

Thanks
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Old 05-28-2005, 07:28 PM   #2 (permalink)
lww
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Re: Perkins idle problem

Your best bet is to follow the traditional methods of determining fault in either pump or injectors/ etc. Try cracking injection lines at the injectors one at a time when idling "rough", to see if you can isolate the problem to one cylinder. If you do locate a bad hole, compare the "spurt" of fuel you get from that location compared to strong injectors. Less fuel might point to a problem within the pump, equal fuel but a miss at a location might point to a bad injector, or mechanical problem coincidentally happening. Try swapping a supposed bad injector to another location to see if the problem follows it. You should be able to isolate if the problem is in the pump, or otherwise. You have confirmed pump timing is correct? As well, any air leaks to the inward flowing fule will create such symptoms.
Lorne
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Old 05-28-2005, 07:38 PM   #3 (permalink)
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Re: Perkins idle problem

I am going to ask a silly question because I did the same!Did you replace the fuel filters when u changed the pump the CAV filters and housing is a very good housing and if the filters are old they may be plugged!I just changed my davy brown filters and they were ugly I have been neglecting the poor old thing! [img]/ubbthreads/images/graemlins/depressed.gif[/img] [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/mad.gif[/img] [img]/ubbthreads/images/graemlins/tongue.gif[/img]
a good way to tell is the amount of fuel returning to the tank there should be a healthy flow not a trickle! if there isn't ya need to check into the filters and the transfer pump!
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Old 05-29-2005, 03:35 PM   #4 (permalink)
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Re: Perkins idle problem

I replaced both of my fuel filters and it didn't solve the problem. I also installed clear fuel hose at the return and the pickup. Unless the fuel is becoming aerated somewhere else in the system and is somehow no longer aerated at the return then air is not the problem.
The fact that the engine idles well when you first start it makes it seem like the problem is not with the injector pump. I am beginning to suspect an injector has a piece of crud in it. Maybe when I removed the high pressure lines a piece of dirt got in there and was forced into an injector, I'm not sure why it only does it after running for a bit though. Once you take the idle up to about 850, the problem goes away (or can no longer be heard).
Very mysterious. I might try installing new injectors (which I just so happen to have).
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Old 05-29-2005, 03:45 PM   #5 (permalink)
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Re: Perkins idle problem

Lorne, I did try cracking each injector line but all I determine was that each cylinder is firing, at least most of the time. Maybe I'll try it again and see if it runs better on 5 without a certain cylinder than with, if you understand what I'm trying to say.
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Old 05-29-2005, 05:59 PM   #6 (permalink)
lww
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Re: Perkins idle problem

Sure, cracking the lines doesn't always provide a clear answer. Once the engine has warmed up a bit she's rough at idle - is there a chance that you've just reached the point you need a valve adjustment? Tight valves can give the same net result.
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