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Old 08-04-2018, 10:23 AM   #51
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Noise stays.
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Old 08-04-2018, 02:02 PM   #52
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Since there is a lot of the noise coming from the thermostat, I took a long shot and opened it up and pulled the thermostat out, refilled with as much coolant as I could, then ran it to see if just by chance the thermostat itself has somehow loose and flapping against the housing.

No dice. Same sound.

If I get the chance, I'll try my luck at pulling the cover to see if I can find anything, but I'm leaning more and more to a serious engine issue at #1 piston. (Underneath the knock, the engine purrs like a kitten, and the knock goes away at around 1500 rpm.)
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Old 08-04-2018, 02:48 PM   #53
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How old are your injectors ?
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Old 08-04-2018, 03:09 PM   #54
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If your engines been running this long there's no serious engine issue.

Do valve adjustment ,check the injectors, reduce the timing, replace all the belts, check your handbrake
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Old 08-04-2018, 03:35 PM   #55
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Quote:
Originally Posted by Uncle Douglas View Post
How old are your injectors ?

Injectors were bought from Davis 7000 miles ago. Timing was done by Ship's Mechanical 7500 miles ago. I have adjusted the valves a few times since then. Once to just make sure, once to experiment with loose valves, and once to really nail it down. I think they are OK.

Based on my testing today, I'm 100% sure it is coming from either the main pulley on the timing belt under the cover (cam shaft gear), or the #1 piston. I can hear it clearly in both spots without the serp belt in place. So it can't be coming from the water pump, or any of the other ancillary front pulleys. When listening to the block or head, it comes across as a tick. When listening to the timing cover it comes across more like a knock. When you hear it out in the open, it sounds like a knocking ringing sound.
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Old 08-04-2018, 03:58 PM   #56
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Quote:
Originally Posted by Napalm00 View Post
If your engines been running this long there's no serious engine issue.
The only thing to add to this is just get in and drive it.
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Old 08-04-2018, 04:07 PM   #57
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I will be pulling the pan first. Now that I’ve shut down as many moving parts as possible, the noise is easier to hear from the block and water pump side than from the front cover. I’m betting I find a worn out bearing or bad piston. I need to change the oil anyway....
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Old 08-04-2018, 04:09 PM   #58
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May be a wrist pin
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Old 08-04-2018, 05:24 PM   #59
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That's new terminology for me.

What should I look for when I pull the pan? I'm hoping to be able to look up into #1, and to see the bearings down low. I'll also see if I can test compression, and get a camera into the top of piston #1.
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Old 08-04-2018, 08:26 PM   #60
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I was just about to proceed with a compression test. But I realized that I was thinking of using the glow plug ports....? but the manual says to use the injector ports.

Process in my head was:
  1. Remove all glow plugs
  2. Connect test kit to one plug port
  3. Crank 10-20 seconds (disconnected fuel solenoid)
  4. Note pressure, then release
  5. Move to next cylinder
Am I OK?
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