after this last month of chasing my tail with trying to dial in my motor, I had cylinders 2 & 4 giving me fits, the exhaust coming off of #2 would get a nice cherry red if I ran it for over more that an idle... thinking it was the head, changed it out and then i dropped a exhaust valve seat on #4. go figure,...
last night I opened up my motor and found out that cylinders 2, 3, & 4 were all a little large in the middle of the stroke. max clearance is listed at 2.995 and these were at 3.003 to 3.004,
don't know if correcting this will solve the problem, but I sure do hope so.
but seeing how I have an over abundance of parts coming in, I thought I would try something that I have read about on the Samba forum. "Connecting Rod Oil Squirter Mod"
there are pinons all over the place on this one.
the best one is that this will put more oil out into the crankcase, which could create a problem with windage...
but you have a side clearance of min. .0060 to a max of .014 on each connecting rod, on the 084. and oil is coming out of this clearance already..."it is just not being directed"
and if you got low of oil pressure, a person might want to look at the some tired bearings....
I am looking at it as an attempt to direct more oil into the end of the piston to take away more heat. "I have noticed on all of the pistons that there is oil burnt on the backside of the crown, maybe a little more oil might help"
some have claimed to have seen head temps be reduced from 50 to 100 degrees. For me, if this works, this would be a big plus..
there have been a few connecting rods come from the factory with a notch built on them.
and there are a few locations that they have been placed. I choose to make a notch on both sides close to the 11:00 position, angling it just past the wrist pin.
the notches are about 1mm / .0395" deep and 2.6mm / .1055" across, I used a 3mm dia mill ball on the end of a dremel to cut it out.
at the this time, and after opening up the case and seeing how tight everything is, this looked like the simplest thing to try.
when I get the rest of my parts and pieces, and reassemble the motor, I will know if this is something to pursue..
I am almost ready to un-bury my other 2a042 genset motor, that still has everything on it. And see if I can get it running just to see what the head temps are with the cooling fan and shroud in place. I just don't have a base of what to compare the head temps to... or what is normal...
I was thinking of drilling and tying into the supply line that feeds the lifters, and use a spring loaded squirter, but with the throws on the crank shaft, there just is not much room for anything..
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