MH44 EFI follow up

I got the MH44 EFI running yesterday.

The head studs still leaked, posted about that.

The new wiring works fine, computer fired it right up.

I am real happy with the power steering running of its own pump now. The tractor steers easier than it ever did even at idle. I would not try to run power steering off a priority valve on a tractor with a low flow or low pressure hydraulic again.

The engine is very quiet now. The governor had thrown a weight and that nicked the cam gear, I cleaned that up when it was apart. The studs that I had installed the crank sensor with were too long and rubbed on the front of the timing cover, that is fixed. I also think the old hydraulic pump was noisy, we will see how the new one is when I get it installed.

Thanks for all the following on this, it has been a challenge.

the last head I put on leaked also ==My cure was a felpro gasket with copper coat -- aviation gasket sealer on the studs into the block then I went with nuts with a small flange with a copper washer under it -- no leaks nowhere with 145lbs of push --maybe an overkill but it held--PS -- I like your fuel inj. set up -- cool stuff

The issue was not the head gasket, it was the studs and I think I am onto that.

I am trying to coax my boy into working on the electronic governor wth me this winter.

think about it -- what pushed the leak past the headbolts -- if there is no outlet there will be no inlet -- my Pa showed me that stuff and it works today to --Roy

Head bolts thread into water jacket

There are a couple of possible units that are simple and convenient. This one seems pretty robust. Electronic Governor EG1065X Jim

I looked at that, seems to be a frequency regulator.

I am planning to replace the throttle body on the 44 with a servo controlled throttle one. The governor will get a tach pulse from the ECM, a throttle signal and control the servo on the throttle body. I am planning on using the Arduino board, it is the standard for college projects now, so get my boy some training.

Seems to need a magnetic trigger to operate. and haas much as 15 amp driver output. Interesting technology. Jim

I have a GM servo throttle body that I bought last year. The Arduino controller has analog inputs, so I can put a TPS on the hand throttle, the TB has a TPS integral. My ECM has a pulse output for a tach input on the governor that I can use, or add a second crank sensor if the pulse output is not accurate enough. I figured that I can build the governor for around $50 plus the TPS and TB. I like fun things like this to do when I get the machining done.

The engine would be completely drive by wire then.

Great for a tractor, I do not like the idea for airplanes, I like real cables and power assist (not that I pilot). Jim

Most new engines and airplanes are fly by wire too.

I can turn on the over rev settings in the ECM in case governor runs away, should do that even with mechanical governor.

I have been following your EFI project for a long time, it has been a very interesting project. I'm wondering what you used to seal the threads of the studs? I sell & service z-turn mowers and have been authorized to do warranty repairs on a few of the different brands of engines offered
on the mowers. That doesn't really make any sense concerning your project other than a mandate by some of the manufacturers of engines I service, the part of all this nonsense I have written is this. I think you will be very pleased with a thread sealant gasket eliminator which
has been included in some of the warranty repairs I have done. The product is called Motoseal, and I think it is a permatex product. I have been
very impressed with this product and now use it a lot. Motoseal seals threads very well and I have used it to replace many gaskets. Many of small engine manufacturers use this Motoseal as the crankcase split gasket which had been a trouble spot on many of the earlier engines which used a paper gasket. I have yet to see a Motoseal application leak. I am sold on this product. The great thing with Motoseal is that it remains somewhat flexible, which is great in sealing threads. The only auto parts store that stocks Motoseal locally is Advanced Auto parts. Sorry for the long post.