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HH120 carb question


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#1 pharmer OFFLINE  

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Posted July 02, 2015 - 06:37 PM

Is there a specific wrench, socket, or combination to properly tighten the nuts that hold the carb on? My Bolens 1253 needs the gaskets replaced but I can't seem to put anything on the left nut and get a good full series of turns. Any help would be appreciated .
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#2 classic ONLINE  

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Posted July 02, 2015 - 07:18 PM

I just use an open end wrench on them. The nuts should have the prong type lock washers and you don't need to yarn down on them. These Walbro carb flanges are prone to bending from over tightening them. Check to see if the flange is bent on your carburetor before installing it. Usually there is a gasket against the block, a sheet metal plate, another gasket, and then the carburetor. Just snug the nuts up after installing the carburetor and snug them up ( not too tight ) after the engine cools the next two or three times that you use the tractor. Just make sure you are not bending the flange as you tighten them. Also, make sure the choke and throttle butterfly screws are tight, and it wouldn't hurt to put lock-tight on them. These screws can come out and end up in your cylinder. I've heard of people putting a piece of metal window screen over the intake port opening before installing the carburetor. Two HH120 engines I pulled apart had dents on the top of the piston and on the bottom of the head from screws getting sucked in.

Edited by classic, July 02, 2015 - 07:19 PM.

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#3 MH81 ONLINE  

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Posted July 02, 2015 - 08:34 PM

:ditto:
Open end wrench.
Good idea on the screen.
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#4 pharmer OFFLINE  

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Posted July 03, 2015 - 09:11 AM

Here is my dilemma . I try using several different wrenches, but I can't get enough throw to actually turn the nut. Should I cut one down to fit? What brand or type of open end wrench?

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#5 MH81 ONLINE  

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Posted July 03, 2015 - 09:23 AM

Mine isn't anything special, just a good fitting open end.
I would not be afraid to modify a wrench if needed.

Last two options (not happy with either)
Pliers on the points to get where a wrench will work
Try turning the stud with small vise grips
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