372xp

[Aled Hughes]

Need some members expertise please, customers 372xp revvs up after completing a log cut and then settles again before the same on next log. This happened today after the saw got warm ( 3 x 15" log cuts) This saw resides on a farm and been left for long periods without use. What are your thoughts? Thanks 

[adw]

Could be a few things from running too lean on the carb low circuit, to an air leak, to a blocked tank breather, to a part blocked fuel filter, if the saw has been left with fuel in it for a long length of time the metering diaphragm could have hardened.

[Stubby]

Just to add to Andrews list , sticking throttle cable .?

[Aled Hughes]

47 minutes ago, adw said:

Could be a few things from running too lean on the carb low circuit, to an air leak, to a blocked tank breather, to a part blocked fuel filter, if the saw has been left with fuel in it for a long length of time the metering diaphragm could have hardened.

Hi again, thanks for your reply would you rule out the crank seals?

[adw]

No it could well be a leak which will get worse as the saw heats up, also if it’s an x torque machine check the induction  boot is correctly aligned to the cylinder.

[spudulike]

Seeing as it is a "customers saw", shouldn't you have the answers!!

Anyway, it could be an air leak but the 372 is generally a pretty robust unit in this area but worth doing a vac and pressure check to discount it. The impulse line can come off and cause this type of issue.

One thing on top of the previous possibilities, is a holed fuel line. The Husky 3 series often had a fuel line that is pushed through the sidewall of the fuel tank and it can split/hole where the fuel line pushes through the wall so get the Mityvac on one end and block the other and pressurise it and see if it holds pressure.

[Crocky]

15 hours ago, spudulike said:

Seeing as it is a "customers saw", shouldn't you have the answers!!

 

🤣 best answer

[Crocky]

the 372s are prone to leaking from the clutch side crank seal, if you're replacing this you need to replace the o ring as well, and i'd suggest replacing the sleeve at the same time. I've had them leak when the seal was changed but the sleeve wasn't. 

 

they also have issues where the intake boot leaks around the intake manifold support, this can happen when its warm. the plastic clamp deforms. farmertec do a metal one that is actually better than OEM. if this needs replaced i'd replace the intake boot at the same time.

 

 

a pressure and vac test should tell you this but may mask the deformed clamp. 

[Aled Hughes]

Thank you so much, i had read somewhere about the farmertec metal clamp👍

[Aled Hughes]

20 hours ago, spudulike said:

Seeing as it is a "customers saw", shouldn't you have the answers!!

Anyway, it could be an air leak but the 372 is generally a pretty robust unit in this area but worth doing a vac and pressure check to discount it. The impulse line can come off and cause this type of issue.

One thing on top of the previous possibilities, is a holed fuel line. The Husky 3 series often had a fuel line that is pushed through the sidewall of the fuel tank and it can split/hole where the fuel line pushes through the wall so get the Mityvac on one end and block the other and pressurise it and see if it holds pressure.

Thanks spud, not actually a customer just a person who will give me something for fixing it.