Construction and other equipment - HD6G bone head move

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HD6G bone head move

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=156810
Printed Date: 22 May 2025 at 8:34am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD6G bone head move

Posted By: Leop
Subject: HD6G bone head move
Date Posted: 30 Dec 2018 at 4:20pm

So thanks to Jim igot my hands on a parts manual. Much to my horror i noticed that the fan is on its own shaft, not attached to the water pump impeller shaft as you would inspect in an automobile engine.

For the past month I have had an aftermarket alternator out of the tractor for repair because when i got the machine it was locked up (filled with mud and rocks due to underwater excursion maybe) and burning the belt. Despite burning the belt might have been turning a tad. This of course means that i have not been driving the water pump for the past month.

Now, im not totally insane because I check all fluids befor starting the machine, and i specifically confirm movement of water through the radiator after startups while waiting for the machine to warm up befor putting her to work.

Regardless of not driving the water pump i see water moving through the radiator, and a close eye has indicated that she has not overheated (though who knows just how accurate that old gauge is), nor has she ever vented out the radiator cap.

So obviously ill get the water pump spining again today. My question is, what gives with having seen water moving through the radiator? Is there a secondary pump somewhere? Would convection be that strong?

My second question relates to having potentially blown a head gasket. I have read that the budha engines are notorious for blowing head gaskets. Im sure the above fiasco didn't help ensure a healthy head gasket. So what am i looking for to see if the head gasket is blown.

I dont see water or steam in the exhaust, nor do I find very much water missing from the radiator; which i think is due to a leak. I dont see any water in the oil.

So what does one look for on these budha engines to see if there is a blown head gasket? Clean injector tip? Pull the head and look? Seepage around the head?

Replies:

Posted By: DMiller
Date Posted: 31 Dec 2018 at 6:14am

The Allis 344 water pump is gear drive, is NOT belt driven, the pulley is for the fan and generator drives only

Posted By: gemdozer
Date Posted: 31 Dec 2018 at 12:15pm

The HD6G have only 1 water pump 4338662 and se is drive by a front pulley and am should have 4 spairs

Posted By: HD6GTOM
Date Posted: 31 Dec 2018 at 7:51pm

I've had a few of these little rascals and never had a head gasket problem. Keep your main clutch brake adjusted and block the steering clutch levers back when you leave her winter set all winter. I forgot to 1 winter and had 1 stick.

Posted By: Eric B
Date Posted: 03 Jan 2019 at 4:05pm

If your head gasket is leaking you can have one or several things happen. You would likely see bubbles in the top of the rad (with no cap on). If the thermostat is tight the rad will puke out coolant by the cap as you get exhaust build up that can't escape to the top until the thermostat opens. If you have a head gasket leak for some time the coolant turns black from the soot in the exhaust that mixes in.

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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!

Posted By: DiyDave
Date Posted: 03 Jan 2019 at 5:52pm

You can check for exhaust gasses, in the radiator, with a kit, like this...

https://www.amazon.com/Block-Tester-BT-500-Combustion-Leak/dp/B06VVBSFTF/ref=sr_1_1?ie=UTF8&qid=1546559500&sr=8-1&keywords=exhaust+gas+test+kit" rel="nofollow - https://www.amazon.com/Block-Tester-BT-500-Combustion-Leak/dp/B06VVBSFTF/ref=sr_1_1?ie=UTF8&qid=1546559500&sr=8-1&keywords=exhaust+gas+test+kit

Posted By: Leop
Date Posted: 03 Jan 2019 at 6:34pm

Well,

I got the old alternator (half of it anyway) installed today and the water pump is now turning. God willing, the old girl will spare me a head gasket job despite my abuse. So far i see no signs of a problem with the head gasket, so hopfully im out of the woods with that one.

Thanks for the tips though.

Leo

Posted By: Leop
Date Posted: 26 Jan 2019 at 3:14pm

Thanks everyone. We had a string of storms out here that have had me cooked up inside, so not much to post.

I do have some pictures finally since 100% of my questions have multiple request for them. Just warning you, she ain't pretty. Now i just need to find a place to host them.

Fyi, the water pump is turning now, and there has been no sign that the motor is any the worse for the couple hours that she ran without it.

Leo