P38Seb

Well-Known Member

• Jul 1, 2024

• #1

I’ve just replaced the viscous fan on the P38. Yet the load roar noise is still present, and the fan appears to be running at full chat even when cold. There’s a LOT of air being blown by the fan.

I let the engine get up to temp and it’s still there and loud. Is it likely a faulty fan or am I missing something? The fan was a new unit from LRDirect as well.

@Datatek before you say to do the air con fan mod, I wanted to give the fan a try first..

 

biketeacherdave

Well-Known Member

• Jul 1, 2024

• #2

OK do the aircon fan mod

 

kermit_rr

Very

Full Member

• Jul 2, 2024

• #3

Run the engine for 5 mins. Stop the engine. Can you turn the fan by hand? Does it stop at soon as you let go?

 

Mark Piercy

Well fumbled member....

Full Member

• Jul 2, 2024

• #4

If it's a britpart unit they let go after a slightly longer time. The mahle viscous fan is better, not cheap but better

 

Last edited: Jul 3, 2024

P38Seb

Well-Known Member

• Jul 2, 2024

• #5

I am stupid. Took it for a drive. Soon as I pulled away it was dead silent.

 

kermit_rr

Very

Full Member

• Jul 2, 2024

• #6

Glad you're sorted. They are good when they work

 

Datatek

Well-Known Member

• Jul 2, 2024

• #7

kermit_rr said:

Glad you're sorted. They are good when they work

Click to expand...

It's just that they don't work for long and fail in a sneaky manner that causes overheating.

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

Full Member

• Jul 2, 2024

• #8

P38Seb said:

I’ve just replaced the viscous fan on the P38. Yet the load roar noise is still present, and the fan appears to be running at full chat even when cold. There’s a LOT of air being blown by the fan.

I let the engine get up to temp and it’s still there and loud. Is it likely a faulty fan or am I missing something? The fan was a new unit from LRDirect as well.

@Datatek before you say to do the air con fan mod, I wanted to give the fan a try first..

Click to expand...

Should roar on startup but quieten down after a minute or so. Shouldn't roar again unless it starts overheating. So fan must be seized and therefore a duff one.

Edit: just seen it quietens down after it warms a bit so all good.

 

kermit_rr

Very

Full Member

• Jul 3, 2024

• #9

With the engine off, if you spin the fan by hand (in the correct direction) it should initially be very stiff but start to get much easier after a few dozen spins. Should be very obvious

 

Last edited: Jul 3, 2024