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Cat D4d overheating

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Avalon Farm
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Joined: 30 Apr 2013
Posts: 1
Location: East London, South Africa

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PostPosted: Tue Apr 30, 2013 11:22 am    Post subject: Cat D4d overheating Reply to specific post Reply with quote

Hi need some help please.
Dozer needed an engine overhaul (3304), since then it has consitantly over heated / boiled after a short time working and worse on hot days.
Have stripped and flushed the radiator, checked thermostat and removed centre of thermostat to be able to work longer before boiling, checked water pump, replaced alternator pulley, had the cyl head done, hoses are new.
Am stumped and don't know what else to check.
Any sugestions will help.
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Tractor Guru

Joined: 20 Jun 2007
Posts: 5019

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PostPosted: Tue Apr 30, 2013 6:28 pm    Post subject: Re: Cat D4d overheating Reply to specific post Reply with quote

First, flushing the radiator might not be enough, it may need to be rodded out to clear out clogged tubes that the flush won't touch. Next, how did taking the center out of the thermostat work? Usually if a bad thermostat is causing one to overheat it's because it's stuck shut so no coolant can flow. Taking one apart, or removing it will usually cause the coolant to flow too fast (((not hanging around long enough to pick up heat like it needs to in the engine and flowing through the radiator too fast to transfer enough heat out of it))) again casing an overheating problem. Another thing I haven't seen personally, but have heard about on several occasions, is a bad water pump. Even though it checks good (ie-the impeller is tight on the shaft) when you look at it, once the system heats up the impeller will slip causing a reduction in coolant flow and an overheating problem. You also said it had been overhauled and the problem started shortly thereafter. If your engine has precombustion chambers it's possible one of them didn't seal and combustion gasses are entering the coolant system that that way. If that's the case eventually it will erode away at the metal around the leak and you'll start seeing coolant getting into the engine when it's not running, but as long as it is running combustion chamber pressures are high enough to keep the coolant out. The same could also be happening due to a bad head gasket but that will typically allow the coolant into the engine much easier than the lower seal on a precombustion chamber will so should be much easier to diagnose as being the problem.

Beyond that I really don't know what else you can check, or do as you've already covered most of the basic checks already. Good luck and keep us informed.
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Tractor Expert

Joined: 20 Oct 2007
Posts: 1673
Location: UK

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PostPosted: Wed May 01, 2013 12:30 pm    Post subject: Re: Cat D4d overheating Reply to specific post Reply with quote

Are we to take it that the engine was not overheating before the overhaul,what did you do, did you change the pistons and liners,if you changed the liners did you check the liner protrusion,if any one of the liners is low hot compression gases can leak into the coolant and cause overheating,the protrusion is crucial,but no point in me going on with it if the protrusion was checked and up to spec,warm the engine up,protect your hand and remove the rad filler cap,fill the coolant up to near the top,start the engine and set the speed quarter throttle,watch the coolant,you are looking for air bubbles coming to the surface,if you see bubbles it's bad news,there is compression getting into the cooling system and you say the head has been checked,the combustion chambers are not pitted and are tight with good gaskets the liners are suspect.
Good luck
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wilson ind
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Joined: 16 Dec 2011
Posts: 2988
Location: linton indiana

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PostPosted: Tue May 07, 2013 2:02 pm    Post subject: Re: Cat D4d overheating Reply to specific post Reply with quote

timming slow????
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