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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]


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[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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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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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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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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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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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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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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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.

Re: Komatsu D20P Dozer [Re: GatorS] #1497 08/23/2020 12:22 AM
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Moved it into the shop, broke my lift messing with it, but now have it in a much better place to get started working on it.

[Linked Image from live.staticflickr.com]

[Linked Image from live.staticflickr.com]

Hope to be able to get started on it soon.


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Re: Komatsu D20P Dozer [Re: GatorS] #1500 08/23/2020 07:25 AM
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A wise man uses plenty of safety blocks under equipment working on it..I sure do..Im not trying to be critical of your operation but I wouldnt trust that lift except maybe with a small car

Re: Komatsu D20P Dozer [Re: GatorS] #1505 08/23/2020 09:30 AM
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I still think that is a neat little dozer! ----- looks like you know the strength of the lift now! Looks like a handy unit to have.


"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] #1520 09/07/2020 11:52 PM
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Well I dropped the oil pan tonight and it's not pretty. The cylinder liner is rusted heavily on a couple cylinders and in one spot the cam shaft is heavily rusted. I think it probably has a blown head gasket, and was left sitting with water in the oil for a long time. I am not a diesel mechanic by any means. It looks to me like I definitely will have to pull the engine. Hopefully I can find a new cam shaft and lifters. I may take the engine out and then take it to someone who knows what they are doing and let them rebuild it.

I didn't do it tonight but tomorrow I will spray down the inside with WD40 or something so that it won't rust more while is is sitting there open.

[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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[Linked Image from live.staticflickr.com]


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Re: Komatsu D20P Dozer [Re: GatorS] #1521 09/08/2020 01:55 PM
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it looks like it could be an in frame if the cylinders don"t need bored ,I have seen a lot worse

Re: Komatsu D20P Dozer [Re: GatorS] #1522 09/08/2020 05:18 PM
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It don't look too bad to me!--like Tom said we have seen much worse and saved them!


"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] #1523 09/08/2020 05:32 PM
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sometimes a dose of kerosene and Marvel Mystery Oil and/or ATF fluid and let it roll around a bit with the starter will flush out a LOT of crap..but it looks as tho yes you had some water in that engine for some time..I'd be leery of the trans/cross shaft compartment just the same, and finals as well. Finals are usually 80w90 but you can't tell what water you might have in there too..an old Cat mechanic told me once-"fix it right,fix it once" (Ontario Bob-RIP)

Re: Komatsu D20P Dozer [Re: GatorS] #1524 09/08/2020 10:19 PM
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I sprayed it down with wd-40 tonight, didn't feel like getting into it too much tonight.

The way the exhaust mounts it looks like it might have filled with rain water. The guy we got it from said it was running when parked, and it sat for awhile. Either way it looks like it was definitely filled with water. Hopefully not from the bottom of a lake....

I plan on changing all the fluids before it gets fixed.

I need to verify the engine model number before I order parts.


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Re: Komatsu D20P Dozer [Re: GatorS] #1525 09/09/2020 11:50 AM
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I would say water---not anti-freeze from the looks of it. --- either rain or lake water. Anti-freeze usually looks different when it goes into the oil,--like real nasty---this looks too clean for that-- gotta be just water.
Main thing to check next would be transmission to see if it too has water in it. --- I would suspect it was just rain got in the exhaust,---easy for that to happen even with a cover on the muffler/pipe.


"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] #1526 09/09/2020 05:51 PM
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with the pan off can you get the engine to turn over at all? or is it locked up tight? you'd be amazed just how durable these engines can be,even with a little water corrosion inside.Clean the pan and oil pump,reasssemble and oil it up with some of the lightest oil you can find and turn it over..if you cana get it to run then OK take it easy with it and let it run awhile..then drain the oil and repeat..it might just flush out what ails it..that cam lobe thats a bit corroded just might flake off and clean up as well..I guess it depends on what you want this to be..if its a linered engine it just might be a weekend rebuild,not too hard to do, you have the shop..not like me that has to schedule things around the weather.

Re: Komatsu D20P Dozer [Re: GatorS] #1528 09/10/2020 11:40 PM
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It will turn over good, had bad compression on two of the cylinders. I may mess with it tomorrow, haven't decided what I'm going to do tomorrow yet.


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Re: Komatsu D20P Dozer [Re: GatorS] #1529 09/12/2020 06:51 AM
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looked like one of the cam lobes had some rust on it,thats the only thing that might be harmed by turning it over as I can see but you never know till you pull it apart..Ive got a Fiat diesel here to do the same with..runs fine but down on HP from normal 115hp, now its down to about 65hp..she's done her time at 11,000hrs


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