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Old 01-22-2010, 06:13 PM
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Default 22r Noise?

Now that it has gotten colder in the mornings I've noticed that my truck makes a noise if I drive it without giving it a few minutes to warm up. The noise is relatively high pitched, and it increases in volume with engine speed. As the truck warms up, the noise goes away. The research I've done so far seems to indicate that it may be a pully or even the speedometer cable, but then I started noticing another noise today.

It is a bad rattling/vibration noise coming from the engine bay. Almost like a there's a loose bolt that's letting something rattle. It goes away if I put the clutch in and let the engine wind down, but accelerating or decellerating it rattles. There is also a definite difference in the rattle driving normally vs WOT at the same rpm, so I'm worried it may be the timing chain.

The truck has 182k and as far as I know the only work that has been done to the engine the past 30 years has been oil changes. There may have been more than that, but I don't have much information about its history going back more than a couple years.

If these symptoms aren't the sign of a timing chain letting loose I'll go through the truck and see if I can find any loose bolts, this was just my first thought so I want to either confirm or disprove it.
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Old 01-22-2010, 07:08 PM
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Your 22R has a double row timing chain, so it's probably not the common 'timing chain rattle'. That only affects 1985 to 1995 22R engines. The timing in the 20R and early 22R is good for 300,000 miles.

The squeal could be a belt, throw out bearing, water pump or alternator bearing, maybe the power steering pump. I would eliminate the easy stuff first, belts, bearings, etc.

Could also be clutch or tranny noise, like a slipping clutch.

Speedo cable in my truck made more of a grinding sound than a squealing sound. It did squeak for about an hour before it seized and broke, though. But the previous year or two it was warning me big time with the noise and bouncing needle, both of which I summarily ignored...

I would also look at the exhaust system, heat shields and loose wires vibrating. A broken exhaust pipe or broken hanger would make a rattle.

OTOH, the previous owner is a known problem, I would ask him for part of your money back on this obvious lemon. :-)
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Old 01-24-2010, 07:18 PM
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Originally Posted by DaveInDenver View Post

OTOH, the previous owner is a known problem, I would ask him for part of your money back on this obvious lemon. :-)



Rick, are the hubs locked? That rattling sound you're describing sounds kind of like the noise I was telling you about that disappeared as soon as I took the drive shaft off and kept the hubs unlocked.
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Old 01-24-2010, 09:16 PM
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Rick, are the hubs locked? That rattling sound you're describing sounds kind of like the noise I was telling you about that disappeared as soon as I took the drive shaft off and kept the hubs unlocked.
Negative, they're both unlocked. the sound I'm hearing is much closer to the noise a cell phone makes when it vibrates on a table as opposed to a deep driveline growl.

Didn't get a chance to really look into it this weekend, I'm suspicious its exhaust or loose electrical connector related. I'm going to take a better look when it warms up and I don't have so much homework to distract me...
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Old 01-24-2010, 10:17 PM
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Negative, they're both unlocked. the sound I'm hearing is much closer to the noise a cell phone makes when it vibrates on a table as opposed to a deep driveline growl.

Didn't get a chance to really look into it this weekend, I'm suspicious its exhaust or loose electrical connector related. I'm going to take a better look when it warms up and I don't have so much homework to distract me...
Wow, these can be tough to isolate. Has the clutch been replaced? I'm betting that the noise is from the throw out bearing, as I've found that even when replaced the bearing can be a bit noisey, especially when cold IMO.

Try engaging and disengaging the clutch to see if the noise tone changes. Depending on whether or not the clutch has been replaced, it may not be an immediate issue. Just be sure to comtinue to pay close attention to any changes in the noise to determine its true source.
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Old 01-25-2010, 07:49 AM
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Fan belt idler pulleys routinely roach their bearings.

You can just buy the bearing BTW.
Scroll Down to Idler Pulley Bearing
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Old 01-25-2010, 08:41 AM
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Fan belt idler pulleys routinely roach their bearings.

You can just buy the bearing BTW.
Scroll Down to Idler Pulley Bearing
I get them from the NAPA across the street from Groove. In fact, pretty sure I have a couple sitting at home and can look up the NAPA/Koyo number tonight if you want, Rick. Literally a few minute job, no press or anything required. Takes a lot longer to get the idler bracket off and on than to R&R the bearing.
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Old 01-25-2010, 02:21 PM
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Is there a test I could do to confirm it's that bearing?
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Old 01-25-2010, 02:32 PM
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Pull it. It will be crunchy and dry. SHOULD be pretty obvious, it is not a subtle failure.

Or... use a screwdriver as a stethoscope.
WARNING: that fan will be VERY close and the screwdriver handle will be in your ear. This is hazardous. I don't EVEN want to hear you had an accident!!!!!!!
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Old 01-25-2010, 02:56 PM
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Besides screwdrivers you can use ratchet extensions, random lengths of wood/aluminum/steel, threaded rod as hasty stethoscopes. Or try spraying the bearing with white lithium grease or WD40 or silicone spray and if it quiets it down temporarily then you know the bearing is toast. Various lubes will work for varying lengths of time but nothing except grease will last long.
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