Cub 1450 - Pressure Sound on Shutdown

[DoubleO7]

if you are hearing the front pto spin to a stop from the seat, you need to replace the bearing in it.

[thefickler]

I don't think its the PTO, because since I have had the mower, the deck has not been on it. So nothing with the PTO is any different. Unless the bearing is now bad based upon what Double07 had said?

I'll try to take a look at it tonight and see if I can find out where this sound is coming from.

I'll also look through the grille with a flashlight and see if I can see the PTO spinning, and see if that's it as well. Thanks again for the feedback,

[drglinski]

Look out, she's gonna blow!

[zippy1]

Originally Posted by J-Mech

More than likely, you have a good engine and you are just hearing the compression push past the rings and into the crankcase and out the vent. The engine stops turning when it hits the last compression stroke that it can't "push" through, so it always stops with pressure in the cylinder. What you are hearing is actually good news.

Only other thing that crosses my mind is a leaking head gasket, but you would most likely hear that when it was running.

It's not the carb.

I be darned. All this time when I hear that "hoosh" sound on my 1650, I thought it was coming out of the carburetor. Well Jon, I'm in the general area anyway....
And I've got "a good engine"

[J-Mech]

Originally Posted by DoubleO7

if you are hearing the front pto spin to a stop from the seat, you need to replace the bearing in it.

I disagree. Could just be the friction disk.

I don't think it's the PTO anyway....

Originally Posted by zippy1

I be darned. All this time when I hear that "hoosh" sound on my 1650, I thought it was coming out of the carburetor. Well Jon, I'm in the general area anyway....
And I've got "a good engine"

Well, you could hear the noise from the carb..... but it wouldn't be the carb. Maybe an intake valve that isn't closed all the way, or not sealed good bleeding compression pressure out the carb.... but that's not the carbs fault.


OP:
If you aren't using the PTO (PTO driven equipment attached) you should leave it on. It's hard on the button/clutch thro out mechanism to run the engine with it disengaged and no load (belt) on it to keep it from spinning. Even the owners manual says that IIRC.

I'm still sure your hearing compression air releasing and it's nothing to get concerned about, but it's good to check things out if the noise is new.

[ol'George]

Originally Posted by J-Mech

I disagree. Could just be the friction disk.

I don't think it's the PTO anyway....




Well, you could hear the noise from the carb..... but it wouldn't be the carb. Maybe an intake valve that isn't closed all the way, or not sealed good bleeding compression pressure out the carb.... but that's not the carbs fault.


OP:
If you aren't using the PTO (PTO driven equipment attached) you should leave it on. It's hard on the button/clutch thro out mechanism to run the engine with it disengaged and no load (belt) on it to keep it from spinning. Even the owners manual says that IIRC.

I'm still sure your hearing compression air releasing and it's nothing to get concerned about, but it's good to check things out if the noise is new.

Good advice J, on keeping mechanical pto engaged, but I think the 1450 has the non brake electric pto, at least my early 1650 does. and it spins down just a bit when motor is turned off for maybe 3 seconds and no belt on it.

[J-Mech]

Originally Posted by ol'George

Good advice J, on keeping mechanical pto engaged, but I think the 1450 has the non brake electric pto, at least my early 1650 does. and it spins down just a bit when motor is turned off for maybe 3 seconds and no belt on it.

LOL. My bad, this was about a 1450 wasn't it.
I didn't realize the early machines didn't have a brake on them. I've never seen one that didn't.