Thread: Heat related loud noise Td5

So based on the story so far lets ignore cooling system for now.
I am thinking a bearing noise.
Idler, Water pump, Pwr Steering pump.

could be the centrifugal filter
could be any of the belt driven accessories
could be a mount collapsing allowing something to touch.

try warming it up, dropping the serpentine belt and seeing if it makes the noise while its warmed up without the belt there.

Originally Posted by strangy

So based on the story so far lets ignore cooling system for now.
I am thinking a bearing noise.
Idler, Water pump, Pwr Steering pump.

Yes, check everything that is run from the "fan" belt, assuming that the noise is there when stationary.

If you have a white, tundra D2a, we could swap utill the problem gets sorted. The wife may never know

Julian

Hi Guys,
Have tried firing up without the serpentine belt plus all idlers & accessories spin fine without issues. Fan bearing was replaced - old bearing had stretched the bearing seat in the casting and new bearing needed loctite bearing "glue". Have checked and it is not spinning in the housing.

Crankshaft damper is in good nick and assembly hasn't rotated etc. New Crank bolt used on re-assembly and torqued to spec.

New genuine engine mounts.

There is a lot of visible turbulence in top of PS reservoir even at idle.

Biggest diagnostic drama is intermittent nature of problem and fact it only does it after a couple of hours on road or 35 degree plus day... seems to suggest it is temp related somehow.

Really appreciate the input.

Charlie

Blknight - That's interesting... When I changed the filter I noticed one of the cover retaining bolts had the thread stripped so it is not torqued fully to spec until I can fix it properly - not leaking though, so I figured was not an issue.

its not the cover bolts that cause the problem its the "bearings" in the filter itself..

the cheap ones do all kinds of wierd random noises, the geunine ones make a kind of protracted "whirring" noise on shut down that everyone imagines is the sound of the turbo whineding down.

Aaaahh... I heard that whirring on shutdown after a coolant bleeding session and thought "that's funny, haven't heard that before" and assumed it was the turbo (which wouldn't make any sense thinking about it...).

Assuming it is the phosphor bronze bush in the middle of the filter element "hat" could that produce such a loud noise as I am getting??

Thanks Dave - gives me somewhere to start looking.

Hi guys,

Don't think the centrifugal filter could be making the volume of noise or the vibration I am getting as the spin down whir that I heard was pretty low. Have disassembled the centrifugal filter and element looks fine with no marks etc on the phosphor bronze centre bushing.

I also pulled the fan hub again to re-check the bearing and it feels a little sticky in rotation. Not much but definitely a couple of very minor tight spots. As before, no sign of the outer race rotating in the housing.

Could a malfunctioning thermostat cause this sort of high temp groan / vibration? Mine was dry for a few weeks whilst everything was pulled apart (yep, grasping for straws).