High-pitched screeching noise.
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High-pitched screeching noise.
At most start ups and shut downs my truck makes a high piched screaching noise. It only lasts a few seconds. I believe it is not starter related but it only happens while the engine is turning over.
The noise seems to come from the front of the engine . The noise is like metal dragging against metal.
The noise seems to come from the front of the engine . The noise is like metal dragging against metal.
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Remove the fan belts and try it then. If the noise presists then it might be an internal problem. If it is quiet then check the idler bearing on the belt tensioner, the alternator by simply spinning the pulley, the water pump by the same means and finally turning the pulley on the power steering pump. The idler bearing is my bet but ,,,,,,,,,,,, shrug
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN
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- asavage
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If the noise is coming from the IPC motor, it's probably a dry idle bearing. You can disassemble it and lubricate it. Ignore the "Contact Discs" text in the pic below.
Also, there's a lot of info on testing them (and running them manually) in this thread.
I made a short video of testing a couple of them. Link to vid is in this post.
Also, there's a lot of info on testing them (and running them manually) in this thread.
I made a short video of testing a couple of them. Link to vid is in this post.
Regards,
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
- asavage
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On an armature (any armature, I think), the idle end bearing is the bearing that is not loaded in normal operation.dn29626 wrote:Where is the idle bearing you mention located?
In the case of the IPC, it's the end that doesn't have the worm drive on it.
But who cares? You're going to grease them both anyway, since it will be all apart . And extra new grease on the Geneva gearset too. And the worm.
I think I bought one from Mouser.com or Digi-Key or Newark. It's not a plug-in part; replacing it requires careful soldering. I often use a larger relay (both in current handling capability and form factor) that won't fit inside the OEM case, and then I mount it outside the case and run extension wires to it. But I think I replaced one relay in a DPC a couple years back with one that does fit inside the case; I can't recall.If my relay is bad, where do i get a replacement?
.dn29626 wrote:With the DCP black box bad, does this disable the starter?
No. The crank circuit is entirely independent of the IPC/DPC, except that the DPC will move the IPC to the "Start" position while cranking. The DPC can't interrupt the starter.
The no-crank condition is one problem.It will not start or shut-off with the key.
The no-shut-off is back to the DPC/IPC problem(s).
I'm guessing you have at least three problems here.
- Starter/switch/wiring;
- IPC noise/wear
- DPC buzzing and possibly not furnishing enough current to the IPC.
The DPC/IPC problem? I would probably run the FSM IPC test I linked to, to make certain that the IPC is moving to each position correctly. You might even find out that the IPC doesn't make any noise when you run the test, that the noise it makes is due to the failed DPC supplying "noisy" current due to the bad relay.
Lastly, the DPC's relay needs inspection. But I'd leave that for last.
Regards,
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
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I removed the IPC and powered it up with jumpers. It made the screech noise several times during testing, even with the cover off. Is it OK to use white lithium grease in it?
I suppose i can lubricate and reassemble the IPC and ignore the noise/wear for now and focus on the DPC. I prefer not putting a cable control to the injector pump, but i am considering it to get it running.
Point out to me (or link) the correct alignment of parts in reassembling the IPC.
I jumper wired the starter, nothing. I think the starter has died. I suspect it's failure may have caused the DPC problem.
I suppose i can lubricate and reassemble the IPC and ignore the noise/wear for now and focus on the DPC. I prefer not putting a cable control to the injector pump, but i am considering it to get it running.
Point out to me (or link) the correct alignment of parts in reassembling the IPC.
I jumper wired the starter, nothing. I think the starter has died. I suspect it's failure may have caused the DPC problem.
82 King Cab 2wd (nice)
82 Reg Cab (body damage)
Anderson , SC
Since Fall 2009
82 Reg Cab (body damage)
Anderson , SC
Since Fall 2009
- asavage
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I would not expect the Geneva gears to make screeching noise, and rarely the worm. I'm sure you're hearing the armature on the bearings it rides on. I don't know how difficult it is to get to the far end of the armature and put some grease in that bushing, but that's probably where it's dry. I show the bare armature above, but I can't recall how it was to reassemble.dn29626 wrote:I removed the IPC and powered it up with jumpers. It made the screech noise several times during testing, even with the cover off.
Yup.Is it OK to use white lithium grease in it?
The 5th pic in this post of Philip's is the best I have available.Point out to me (or link) the correct alignment of parts in reassembling the IPC.
YupI jumper wired the starter, nothing. I think the starter has died.
Regards,
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
Al S.
1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
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