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Messages - Willw

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Engines / Re: Adventures in Engines Part 1
« on: August 06, 2019, 09:17:09 PM »
Hi guys, and thank you all for your input.

I swapped all of the parts back into the original crankcase, minus both of the injection pump shims, a bit of silicone between the pump and case to prevent oil leaks, and now she starts and runs with the first pull.
The pump is still not advanced to spec, but I view that as a plus since now it doesn't knock as badly at slower RPM, and the customer is happy with it.

Just to clarify: this engine is designed to run counter-clockwise, unlike all of the other clones that I have seen.
In order to achieve this properly the camshaft is designed for this purpose with the lobes placed accordingly.


Here is one of the giant brutes running

No "Little Giant" here.

Engines / Adventures in Engines Part 1
« on: July 22, 2019, 03:12:12 AM »
Hi guys, thought I would share my latest head-banging air cooled Yanmar clone experience with you.
A customer of mine who imports goods from China contacted me re: a new cement mixer which wouldn't start, which was part of a batch of 6, and the only offender.
To make it brief I ended up dismantling the entire engine several times, changing the injection system as well but it just wouldn't run.
At my wits end I took the cylinder (crankcase) and piston to the machine shop to have the clearance checked and I was told that the cylinder was bored too large for the piston, which was rocking in the bore and upsetting the piston ring seal. It sounded possible and we even compared the fit to a different cylinder that I brought along.
So I informed the owner and he ordered a new cylinder which arrived with his next shipment.
I swapped the various parts from the original engine to the new crankcase, added a new set of rings and assembled the bottom end no problem... except the crankshaft would not rotate when the fasteners were tightened. Detective work and add approx. .040" of shims between the crankcase and it's cover (which is from the original engine).
Slap all other parts on after that, add oil and fuel (the same fuel still in the tank from before) and off we go. Same results as before... not a blink. What the $%^& now?

Here is where it gets a bit strange; these engines are the first left-hand rotating Yanmar clones that I had ever seen. The flywheel had 2 sets of timing marks; the normal right hand marks which were painted over but visible, and the left hand marks. While rocking the flywheel by hand to squirt more fuel into the cylinder for yet another starting attempt, I happened to notice the timing marks as I listened to the injector fire, and as far as I could tell the injector was firing somewhere between 5* BTDC and 5* ATDC. Aha, I knew that these engines normally run with close to 20* of advance, so off with the pump and remove both shims that were behind it.
Check timing again... looks better now but still not ideal, but what the hell, wind up the rope and let 'er rip... Success at long last. Shut her down and try again...success again.
But now injection timing still not advanced to the spec with no shims under the pump; what does that mean?
The best I can figure is that the camshaft, or at least the fuel pump lobe, is ground retarded, I will investigate this further when I take it all apart again to put the parts back into the original crankcase.
Why put myself through this you ask? Remember that .040" shim? Now the camshaft has at least that much float, possibly more.
So where did I go wrong? Remember these cement mixers are supposed to be test run at the factory, and I assumed that this one was, but obviously that was not the case.
So I checked ring gaps, valve clearances, everything except that one thing, the injection timing.
In the end I will probably have disassembled and reassembled this engine 5 or 6 times, sad, but I've learned my lesson.
The bright side to all this is that this engine is the 2nd of two that I had to fix as a barter, because inside the very next container from China is my very own ZS1130 horizontal diesel which this customer paid for up front. For some reason I find the thought of that strangely motivating ;D.
But aren't I forgetting something? Isn't the cylinder bored too big for the piston?
I have long suspected this to not really be the case, but in the absence of a better theory I went with it.
So I will roll the dice one more time and I will update you in part 2 of "Adventures in Engines" ;D

Petteroids / Re: PETTER - PAZ1 - New project
« on: July 22, 2019, 12:41:42 AM »
Congratulations VP, a job well done.

Changfa Engines / Re: New Watercooled Diesel Toys
« on: June 29, 2019, 07:09:51 PM »
Hi Glort, I've been running into a few cases of bad fuel recently and I was thinking that was the cause of your starting problem, but you've already investigated that, so like you I'm leaning towards the nozzle.

Sometimes after bleeding the fuel system thoroughly I like to turn the flywheel by hand very slowly and observe the injector spray pattern that way; it might tell something about the condition of the pump as well.

Good luck with it and keep us posted.

Lol 38ac,
It is likely that neither of them will do anything useful aside of keeping me company.

You've put my engine collection in a nutshell with that one ;D

Re: quick engine warm-up. I recall reading somewhere about putting a valve in the lower water pipe so that flow into the engine can be adjusted to achieve quick warm-up as well as stable engine temps.
That is how I have mine and it seems to work well.

Petteroids / Re: PETTER - PAZ1 - New project
« on: May 12, 2019, 01:57:43 PM »
Well done VP, you did not disappoint.

Listeroid Engines / Re: ajaffa Bob OK ?
« on: May 07, 2019, 04:40:19 PM »
Hi Bob, glad to know you're OK; had me worried there for a minute.

I wish you a speedy recovery.

Petteroids / Re: PETTER - PAZ1 - New project
« on: April 30, 2019, 12:03:37 PM »
Good work.

I'm looking forward to hearing it run.

Other Slow Speed Diesels / Re: Picked up something interesting
« on: April 29, 2019, 02:18:03 PM »
Also available in hardcover...

Other Slow Speed Diesels / Re: Picked up something interesting
« on: April 29, 2019, 02:15:38 PM »
I watched the video again and I'm wondering if the noise we are hearing could be resonation of the wood that the engine is attached to.

Maybe the engine is just not heavy enough to plant the wood firmly enough to prevent vibration?

Broncodriver99, when you get her running how about you bolt her to 2 pieces of 4x4 wood, rest her on the ground, not concrete or a similar hard surface, and do a short video.

Some of us are looking forward to hearing and seeing yours run anyway, and it would be an interesting test.

BTW this manual features your KA27 as well as many other interesting engines. I am currently using mine as a guide while working on a Deutz F1L210D.

PM sent...

Other Slow Speed Diesels / Re: Picked up something interesting
« on: April 28, 2019, 04:48:29 AM »
Hi Broncodriver99, here is a video of one running that I found on YouTube.

It sounds pretty healthy.

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