Hatz Z790 Engine Manual

28.06.2017admin0 Comments
Hatz Z790 Engine Manual 4,7/5 1751reviews

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Hello everyone, I have a Hatz E785 diesel one lunger engine that I am trying to breath life back into. It has been sitting for a number of years, nobody really knows how many.

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I found an operators manual out on the web that has a lot of information execpt the manual always references pictures 8, 10, 20 etc. The manual doesn't have any pictures so there must have been a fold out that got seperated at some point. The vendor doesn't have any idea of what I am talking about and there isn't a local dealer in Alaska so I am hoping that there might be somebody that can help me out. I have a call into the Hatz in Wa state and he might call me back someday (I hope) but I'm not holding my breath. Can anybody help?

Thanks, Northwind Paul in Wasilla, Ak. Paul, I would call the Hatz distributor again. Ask for the owner, if necessary, if you can get a live person. I don't like voice mail.

You should be able to get an operators manaul and parts book at a very reasonable cost. I have a couple Hatz E-786 engines which are almost identical to your E-785. The 785 is indirect injection, and the 786 is direct injection. I am familiar with the 'E' series engines, and will try to answer any specific questions, but I am not a technician. Preliminary things to check (assuming the engine is free): 1. If the engine has been stored outdoors, head and front gear cover removal are recommended to inspect cylinder, valves, and free operation of the governor mechanism. Do you have compression?

With fuel in the tank, and throttle at full speed position, does the pump and injector work when the engine is hand cranked? A very audible 'snort' will be heard when the injector functions. Hi Jeff, Thanks for the reply.

We bought a IR compactor with this engine on it from another fellow that was going to get it running. Well he is moving to the lower 48, I believe to Ohio, and we picked this out of his sale items.

It has been outside with no hint of protection for many years. We first drained the oil sump which had a lot of water at the bottom. Enough that there is rust on the bottom of the crank counter weights. Did a thorough flush with diesel twice and then put in about 1 1/2 qts of 30w oil. Used the hand crank to check out the valve action which revealed there weren't any stuck valves. Pulled the injector nozzle for inspection, looked okay and had a good spray pattern when reassembled and hooked up to the pump. Had a fair amount of compression but I need to make an adaptor for my diesel compression tester to tell exactly how much.

We noticed leakage of both intake and exhaust valves so the head was removed. Both valves and seats need reground and knowing the face angles would be a great help. The operator’s manual has a great deal of information except for pictures. Since there aren’t any decals or markings on the engine it is difficult figured out several things. What is the start position of the throttle lever? What is the extra fuel button? We did figure out the decompression knob.

Rather slick way of doing it. Thanks in advance, Paul. Paul, The throttle lever is pushed toward the engine to shut fuel 'off'.

Pull out, away from the engine, to increase speed. The excess fuel button is a cold weather starting aid that increases fuel delivery substantially causing a lot of smoke at starting, but it works well if you need it. Saturn Vue 2007 Manual. To use it, set throttle to near full speed, and then pull 'up' on excess fuel button. It will latch 'up'. Start engine in the normal manner. Close the throttle to idle as soon as the engine starts, and the excess fuel button will reset restoring normal fuel delivery. Remove the head and take it to any good engine shop to touch up the valves and seats.

Before reinstalling the head, anneal the copper head gasket, and reuse it. If the engine is not used for some time, always roll it over to make sure the valves are closed. They have a habit of stopping with a valve open allowing for potential corrosion of the valve face.

I've come across a lot of Hatz Z790 diesel engines for sale in the local area. Turns out a local AFB has them for sale on auction. The engine is air cooled, 2 cylinder, and puts out between 18 to 26 hp or so, depending on how they're set up. They're pretty tall--approx.

27', so I'm wondering how they'd work to repower my JD420, and maybe, ultimately, my Dayton 3Z678 (MTD 995). I searched the forum and couldn't find any information. Has anyone used these in a repower, or have experience with them? There's a YouTube video listed below that shows one running.

Thanks, Smitty. I did a little digging into these engines and came up with some interesting information. Olcowhand was involved in a discussion about these back in 2007 on another forum and some good information was brought up by people involved with the maintenance of these engines. First off, it would seem they are designed to operate only at 3000 rpm or idle. Sounds like you flip off the idle switch and hang onto your hat.

As mentioned above they are very heavy. It looks like the opening bids on the Gov. Auctions starts at $25.00. The highest bid I saw was $200.00. Hill AF base seems to have a bunch of these things available. Now if we can convince Smitty to pick one of these up and give us an update.. I did a little digging into these engines and came up with some interesting information.

Olcowhand was involved in a discussion about these back in 2007 on another forum and some good information was brought up by people involved with the maintenance of these engines. First off, it would seem they are designed to operate only at 3000 rpm or idle.

Sounds like you flip off the idle switch and hang onto your hat. As mentioned above they are very heavy. It looks like the opening bids on the Gov. Auctions starts at $25.00. The highest bid I saw was $200.00. Hill AF base seems to have a bunch of these things available.

Now if we can convince Smitty to pick one of these up and give us an update.. Now after 6 years, I have totally no recall of that discussion at all! But yeah Smitty.they'll fit in there easy as pie! I did a little digging into these engines and came up with some interesting information. Olcowhand was involved in a discussion about these back in 2007 on another forum and some good information was brought up by people involved with the maintenance of these engines. First off, it would seem they are designed to operate only at 3000 rpm or idle. Sounds like you flip off the idle switch and hang onto your hat.

As mentioned above they are very heavy. It looks like the opening bids on the Gov. Auctions starts at $25.00.