10 hr's on 422

johara1 · Mar 17, 2003

Re: 10 hr\'s on 422

bmkar,
i still think it's fuel related, this engine,has a problem with the governor. it's always hunting it doesn't matter speed it's at.
i don't have a book on the motor,so i can't trouble shoot anything. so i guess the shop is the next best thing. /forums/images/graemlins/confused.gif

Anonymous Poster · Mar 18, 2003

Re: 10 hr\'s on 422

Does it "hunt" or surge with or with/out a load or under both conditions...did it behave this way when you first started using it(9hrs ago)...sounds like a lean surge...it will cut out under heavy load under the "right" conditions.
1st I'd check the bottom of the tank to see if there is any sediment, if there is, some may have gotten past the filter(don't know how) and clogging a (main) jet...
2nd I'd probably try a fresh batch of fuel give it time to work thru,maybe too much alcohol (and/or moisture in the batch you have)...
3rd(maybe 1st) the book show gov. spring attached to MIDDLE of 5 possible holes at end of gov. lever with the other end attached to endmost slot on speed control lever...
and...the gov rod hooked from the butterfly lever to the 1st hole adjacent to the grouping of 5 holes at the end of the gov. lever. hope that makes sense... /forums/images/graemlins/crazy.gif
I'll check my linkage tonite to see if mine matches the book.

It is easy to pull the top of the carb off to view the level in the bowl(to verify that pumping is sufficient)

johara1 · Mar 18, 2003

Re: 10 hr\'s on 422

bmkar,
i have been so busy with it i didn't have time to get into it.
a major driveway repair 66 tons of stone, 1/2 a tri axle load of mulch,that was froze and a tree that went down this winter. i should measure the size of this tree it moved,it might be a record. this thing is amazing!!!
i had trouble with the valve cover gaskets again,it started leaking and then i had to shut down.the gasket seems to slip and no amount of tightening makes a diff. oil everwhere.
i called two places that are robin service centers,one still will work on them.so i ask about parts they ordered the two gaskets. icut one out of a shoe box till they get here. i'm going to go through everthing.
that hunting thing is when its hot, no load or full load it doesn't matter, this may be tied in into this shut off thing when you drop it.
there is some nasty looking stuff in the tank, think i'll drain it, and check the filter first then the carb.

Anonymous Poster · Mar 19, 2003

Re: 10 hr\'s on 422

Sounds like you're doing real work...It does sound amazing when you consider what one man can handle compared to one man with this tool. /forums/images/graemlins/laugh.gif

I checked my linkage last night to compare to the book... there was 1 difference...from the endmost slot on the speed control lever, the gov. spring goes to the endmost hole on the gov. lever (not the middle hole).
Another question regarding "lean surge", when the condition starts, can you clear it some by "inching" out the choke? If this helps, then the carburetor will probably have to be cleaned out.
It was pointed out to me that one emissions related change involves making the "choke-plate" spring loaded, such that it partially opens as the engine runs faster, no matter where the lever is set. Remove the air filter to see.
On the leaky gasket, I used to have Saabs that always leaked at the rear corner of the valve cover because a puddle of oil would sit internally right across the seam and just eventually work it way thru. The fix worked better than the factory assembly and involved these steps...
1)With covers and fresh gaskets apart...use a solvent like brake cleaner or alcohol (on a rag) to TOTALLY degrease cover and head mating surfaces.
2)using a silicone gasket sealer, (I use to use bathtub caulk)apply to all four surfaces, a very thin layer with your finger... you don't want any squeezing out after torquing down.
(the 4 surfaces =cover,both sides of gasket,head)
3)WAIT for it to "tack"up(partially cure), then assemble and torque to factory specs. (2.2-3.6 ft.lb.)...Now if those fasteners are backing out with thermal cycling, may have to do it again with thread locker(blue or red,don't remember which)
After looking at this engine, I'm going to have get an inch-pound torque wrench or get my wrist recalibrated 'cause everything is aluminum /forums/images/graemlins/crazy.gif
Sorry for the winded post, my wife says I give way too much detail /forums/images/graemlins/grin.gif

pajoube · Mar 19, 2003

Re: 10 hr\'s on 422

bmkar
Thanks for your observations, keep the details coming.
PJ

johara1 · Mar 23, 2003

Re: 10 hr\'s on 422

bmkar,
a day without the pt is like a day without sunshine! but a whole week is devastating.
i broke down and called a robin service center for help. new valve cover gaskets are back ordered from the factory!
the governor problem is to be fixed(under warr. i hope) if it's water and dirt, it won't be. so on the trailer and up to the service dealer,he saw the sediment in the tank and he said that just might be the problem.
so i just sit and wait. /forums/images/graemlins/frown.gif

Anonymous Poster · Mar 24, 2003

Re: 10 hr\'s on 422

Sorry to hear of your trouble...sounds like the longest wait will be for the b.o. parts(gaskets)...the lean surge should be a quick repair/adjustment. I still feel this engine design seems to be a "repair" friendly design in terms of access and layout...compared to my Cub Cadet/Briggs Vanguard.
Let's hope it doesn't need a lot of repair. /forums/images/graemlins/smirk.gif