K341 exhaust pipe threads

[TOPDOWNRESTO]

Gents, just bought a 1650 QL , bought a new muffler exhaust elbow p/n KH -45-054-04 . in original Kohler box. Threads in head are in perfect shape but the new elbow only gets 3/4 turn in, can go a little more but not pushing it.
Threads on new elbow appear straight and not a pipe thread. I have a piece of brass pipe thread that goes all the way in no problems. whats up here ? what should threads be. Do I have a miss boxed item ?

Thanks
Carroll

[J-Mech]

Part number is correct.

The elbow threads into the block, not the head.

Get a pipe coupling and see if the new elbow will screw into it. I'd just carry it to a hardware store and try it if you don't have one. My assumption is that the new elbow has a burr on the threads.

[twoton]

Hey Carroll,

Did you get one of these;

[TOPDOWNRESTO]

Already did the hardware store check, anything with a pipe thread will not screw on to the exhaust pipe.
Yes I do have a new locking ring

Will recheck threads, I believe they are 11.5 , already chased with a thread cleaner rake. The elbow and threads are painted black, possible need to check again for cleanliness but only goes on 3/4 of a turn ,to me somethings not right, as a brass fitting with pipe threads easily ( snuggly) goes all the way in.

Thanks for your response guys

Also have a 125 Im restoring too, needed a GT to do the lawn duties as the 125 is all completely torn down for paint removal , will not make it in time for spring...so the 1650 QL came along.

[twoton]

Good luck with your projects and post up a few pictures when you get a chance.

And hey;

[ol'George]

First,welcome to OCC!
Normally a pipe thread is tapered and set to start about 3/4-1 turn by hand, then a pipe wrench turns it home.
Possibly they are thinking that the threads are rusty and a bit oversize thus supplying a bit oversize cut thread.
Has the new elbow been dropped/distorted?
You say it is a genuine kohler part,
so you have some choices:
You can return it as defective,
Or run a bottom pipe tap into the block to insure that it is indeed to size and clean/carbon/rust free to accept the elbow.
If all this checks out, run a pipe die on the elbow if needed to get it to size.
I'm betting the elbow is a bit big,and there is some foreign material in your block thread as is usually the case.
Let us know what you find.
I would run a new pipe nipple from the hwd store into your block as a size check, it you do not run it home with a pipe wrench you can return it.

[TOPDOWNRESTO]

Thanks, will get down to the shop and check it out again. Snowing like hell here in NY near tri states wish this was up and running as it came with a 45'' two stage sno blower !

[J-Mech]

What blower? Cub didn't make one (2 stage) designed for the QL tractors.... except the 351, and you had to have the ultra rare adapter to use it on a 1650. The 450 model will attach, but the belt size for the PTO won't work.

[TOPDOWNRESTO]

It is a 450, I would have to check and see if the pulley on the blower was changed. I know the PO had drilled a hole on either side for the pins at the very front of the frame. Other than that its a nice unit for the QL 1650.

[J-Mech]

I suppose he could also have put a PTO on from a later series machine. Pretty sure they would fit.

Nice for a 1650..... maybe. Bit under-powered. I've had a 450 for years I run on an 1811. I wouldn't want it on any smaller of a motor.