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Komatsu D20P Dozer #1332 05/07/2020 12:37 AM
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GatorS Offline OP
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I bought a dozer about a month ago with my father inlaw. He had no luck with it sO I decided to bring it to my house as I have more time than him to mess with it in the evenings.

I brought it home this weekend and started working on it. So far it's not good, I drained the oil and it looked like mud. Looks like this will be a rebuild thread, and since I haven't ever done rebuild a diesel engine this might be an adventure.

Pics to come soon.


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Re: Komatsu D20P Dozer [Re: GatorS] #1333 05/08/2020 12:13 PM
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sonny Offline
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WOAH!! ---That sucks!-- Well --diesel is the same as gas--except for injection pumps and injectors, so it should be easy to work on.-- I assume its metric bolts and Komatsu parts should be common so that's in your favor ----- unlike the motor on the chipper I did have that was a VM Motori which was Italian and NO parts what so ever!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Re: Komatsu D20P Dozer [Re: GatorS] #1383 06/07/2020 11:33 PM
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I did a compression test on the dozer about 3 weeks ago. It was not good, It had 200, 240, 70, 60. I posted this on FB and was suggested to put a little oil in the cylinder and retest the compression. I finally did that tonight and the compression didn't change.

I guess the next step is to pull the engine and tear it down. I think I'll finish the mower before I jump on that. Here are some pics of it.

Bringing it home
[Linked Image from live.staticflickr.com]

The hour meter shows 1635 hours. Here are the sprockets. I'm not a track expert, sprockets look sharp to me. Got to get it runniing before I worry about that. Track tensioners are also pretty tight.

[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


[Linked Image from live.staticflickr.com]


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Re: Komatsu D20P Dozer [Re: GatorS] #1384 06/08/2020 12:13 AM
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GatorS Offline OP
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Komatsu D20P Oil and unload

Subscribe to my channel while you watch...



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Re: Komatsu D20P Dozer [Re: GatorS] #1385 06/08/2020 02:35 AM
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sonny Offline
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Sounds like engine rebuild will be needed. Former owner didn't take care of the machine??? Sprockets do look way too sharp----when you get the engine fixed and everything else works good-----then you can do track work but maybe use it a little first.
It looks like a nice dozer overall and a handy size to move around.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Re: Komatsu D20P Dozer [Re: GatorS] #1387 06/11/2020 08:00 AM
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bunkclimber Offline
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is the Komatsu D20 engine a wet liner or direct bore engine? I just did an Isuzu C240 with thinwall chrome liners..what a PITA

Re: Komatsu D20P Dozer [Re: GatorS] #1388 06/12/2020 01:00 AM
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I believe it has wet liners. Never done one before should be an experience.


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Re: Komatsu D20P Dozer [Re: GatorS] #1389 06/13/2020 12:03 PM
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sonny Offline
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From the pictures of the overhaul kits offered on e-bay,---they are wet sleeves from what I can tell.


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Re: Komatsu D20P Dozer [Re: GatorS] #1391 06/15/2020 08:36 AM
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JIM Offline
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They are a PITA to do for sure.


I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.
Re: Komatsu D20P Dozer [Re: GatorS] #1395 06/15/2020 02:43 PM
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bunkclimber Offline
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Jim the dry thinwall chrome liners like in Kubotas and my Isuzu compact diesels are a PITA..the heavywall liners are quite easy to do with the proper tool..OTC and others make the liner pullers they go about 800 for the kit thats pulls them out.You might be able to fab one(yes we are machine builders here) it could be done with some 1"all thread or (better)-acme threaded grade 8 rod and some heavy pattern nuts..I tried to fab one for the thinwall liners but it didnt work,they were clinging to the block like no ones business,very tough to move,I finally had to torch them out with a gas welding torch,heating the metal and peeling it in a strip,off the block wall then curling it in on itself and pulling out. The new ones went in easy once shrunk with dry ice, a block of hickory and a deadblow hammer. I think the critical thing to watch is deck protrusion of the new liner once inserted into the block and lubing of any o-rings that fit on the liner to seal coolant.The dryfit liners have no o-rings,they only seal combustion,the coolant never touches the dryfit liners.

Re: Komatsu D20P Dozer [Re: GatorS] #1396 06/15/2020 05:36 PM
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sonny Offline
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I think the ones in my Detroit 3-71 were dry type. ---I just got under the tractor and knocked them out with a square iron bar,---might have gotten lucky on that one! lol!


"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
Re: Komatsu D20P Dozer [Re: GatorS] #1401 06/15/2020 08:37 PM
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I did a job for a buddy years ago. it was a box \truck think it was a Volvo engine if I remember right. there were o-rings on the cylinders. I fabricated a jig with all thread to both pull the old cylinders and press in the new ones. Only had to redo one cylinder. felt lucky.


I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.
Re: Komatsu D20P Dozer [Re: GatorS] #1403 06/18/2020 06:26 AM
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bunkclimber Offline
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Sonny the Detroit engines are a beast all in themselves but are wet liners from the ports up. The thinwall liners Im speaking of are thin chrome plated wear liners,about 1/8" thick that press fit inside the block cylinder bores of small diesel engines..think a standard block,iron bore but a thin liner-(like a smooth tin can)-that presses into that takes the wear. A lot of people cant figure them out because for the most part they are a PITA to pull out. There are tools to do it,but most ive seen done just get torch heated and peeled out..you have to shrink the new liner with dry ice to get 'em installed.They have an interference fit,usually with a lip at the top that fits a recess in the top of the bore to seat them.Nothing at the bottom.
Jim the Volvo job you describe is standard cylinder liners you pull out.To get us back on subject I believe Gator's Komatsu is regular thick liners.

Re: Komatsu D20P Dozer [Re: GatorS] #1404 06/18/2020 12:26 PM
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TomB Offline
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I have done most liner replacements all 71gmc are dry liners till you get to the 92 engines, the c24 I built a puller to get them out and push them back dry. the thing to look for on wet liners is the O rings some engines have top and bottom were others go in any grove.

Re: Komatsu D20P Dozer [Re: GatorS] #1405 06/19/2020 07:20 PM
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bunkclimber Offline
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Hey Tom I got the 71s confused with the 92s. They drop back in pretty easy if everything is clean but lube the o-rings with Crisco or whatever shortening you have.Works like a champ

Re: Komatsu D20P Dozer [Re: bunkclimber] #1406 06/20/2020 02:05 PM
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TomB Offline
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I did a jd that had two different color O-rings one for coolant one for oil the case used one color for both groves I use soapy water for lube.


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