overheating problems part 1

Submitted: Tuesday, May 25, 2004 at 19:42
ThreadID: 13160 Views:1501 Replies:8 FollowUps:11
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just some info we were given today at work about overheating problems.
the diesel engine
WHAT PROBLEMS DO THEESE ENGINES EXPERIENCE.
the cylinder heads crack between the precombustion chambers and between the exhaust and inlet valves.
frequently blown head gaskets.
WHEN ARE THEESE PROBLEMS LIKELY TO OCCUR.
they may occur when the vehicle is pulling a heavy load or performing hard 4wd work and using a turbo.
or it can simply happen at any time after the engine has reached an age where its operating in a marginal enviroment.in other words its just coping.in this situation high ambient air temperature can be enough to create any of the problems described above.
WHAT CAUSES THE PROBLEM.
there are a number of causes.with each engine type having all or some of theese problems.the fact that we find most disturbing is that theese problems continue to happen from model to model.current model engines are generally not an improvement.
BADLY DESIGNED WATER JACKETS.
the coolinjg sytem is desiigned to transfer heat from the engine to the radiator so that the heat can disipate.often the coolant is trapped in areas around exhaust ports or pre combustion chambers and is not able to circulate due to poor water jacket design.in theese cases the coolant boils and turns to steam.
WATER PUMP FLOW PRESSURE.
often water pumps are unable to continually maintain appropriate water pressure in the cooling system while operating.for example whilst driving the vehicle at 85 kph the pump pressure may be 12 psi.however a small increase in speed to say 97kph may result in the pump pressure dropping to zero.this inturupted pressure will vary with eacch vehicle and depend on the operating load,rpm and air temp.
on theese ocasions the pump pressure drops and the water remaining in the pump housing will cavitate and turn to froth and steam.and there is no water movement to help disapate heat.in other words the coolant above the exhaust ports can not flush away the heat while it is not moving.therefore the water boils and turns to steam.this isolated boiling is known as nucleate boiling.this steam displaces more coolant,placing more pressure on the cooling system,causing temprature to rapidly increase,blowing hoses gaskets and cracking cylinder heads.
COOLANT BOILS OR VAPOURISES IN THE BODY OF THE WATER PUMP.
when the pressure inside the pump falls bellow the vapour pressure of the coolant,vapourisation or cavitation will occur.every body knows that water reaches boiling at lower temperatures when it is boiled at higher altitude(lower air pressure).
BADLY DESIGNED PUMP IMPELLERS.
since the mid 90s the design and construction of water pump impellers has been dominated by the pressed steel unit that looks like the blades of a food prosser.theese impellers aerate the coolant and create inadequate coolant flow.
THE PUMP BY-PASS SYSTEM IS OFTEN CORRUPT.
there is insufficiant coolant passing through the pump when the thermostat is shut.this contributes to cavitation and water pump pressure problems.
GASKETS THAT RESTRICT DOMINENT FLOW.
much to our surprise we are discovering engines that have head gaskets that have been designed incorectly.this applies to both OE and aftermarket gaskets were designed this way. However at this stage we warn you to be vigilant when fitting a gasket. If you have any doubt please call 1800 ....... We do have gaskets in stock for some of these models, that have been upgraded to solve these issues.

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Reply By: Member - Glenn(VIC) - Tuesday, May 25, 2004 at 20:08

Tuesday, May 25, 2004 at 20:08
Gee Mrs Diamond, thanks for the insightful post, great to see some people are serious around here.....hahahahaha

Cheers
AnswerID: 60130

Follow Up By: Mrs Diamond - Tuesday, May 25, 2004 at 20:20

Tuesday, May 25, 2004 at 20:20
well i try
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Reply By: Member -Bob & Lex (Sydney) - Tuesday, May 25, 2004 at 20:23

Tuesday, May 25, 2004 at 20:23
You have an unusual job for a women Mrs Diamond
AnswerID: 60136

Follow Up By: Mrs Diamond - Tuesday, May 25, 2004 at 20:32

Tuesday, May 25, 2004 at 20:32
whats so unusuall about head jobs on cars and fourbys lol
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Reply By: Willem - Tuesday, May 25, 2004 at 20:29

Tuesday, May 25, 2004 at 20:29
Hello Mrs Diamond,

Maybe there is some sense in me driving an old technology vehicle, after all.
Thanks for the interesting post.

Cheers
AnswerID: 60138

Follow Up By: Mrs Diamond - Tuesday, May 25, 2004 at 20:31

Tuesday, May 25, 2004 at 20:31
i try my best mate i try my best lol
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Reply By: Al & Mrs Al (Vic) - Tuesday, May 25, 2004 at 20:44

Tuesday, May 25, 2004 at 20:44
Mrs. D...when do we get to read part 2.

AnswerID: 60141

Follow Up By: Mrs Diamond - Tuesday, May 25, 2004 at 20:47

Tuesday, May 25, 2004 at 20:47
when my fingers are better it took me an hour to type the first bit haha
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Follow Up By: Member - Geoff & Karen - Wednesday, May 26, 2004 at 00:22

Wednesday, May 26, 2004 at 00:22
So you are a slow driver and a slow typer
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Follow Up By: Mrs Diamond - Wednesday, May 26, 2004 at 12:53

Wednesday, May 26, 2004 at 12:53
go away loser.
hahahahahaha
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Reply By: Mad Dog (Victoria) - Tuesday, May 25, 2004 at 20:55

Tuesday, May 25, 2004 at 20:55
Thanks Mrs. I wonder if we would still have these head problems if they didn't make them out of coke can material.
AnswerID: 60144

Follow Up By: cokeaddict - Wednesday, May 26, 2004 at 20:12

Wednesday, May 26, 2004 at 20:12
hey whats wrong with coke?
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Follow Up By: Mad Dog (Victoria) - Wednesday, May 26, 2004 at 21:49

Wednesday, May 26, 2004 at 21:49
Ha, the missus shakes her head at the number of 2L bottles I polish off every week. She'd have a fit if she knew how much I drink at work. I've gotta stop, get fit, do a few laps around the block followed by some pushups. see ya!
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Follow Up By: cokeaddict - Wednesday, May 26, 2004 at 22:25

Wednesday, May 26, 2004 at 22:25
Ok so now I know where my twin got to !
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Reply By: Truckster (Vic) - Tuesday, May 25, 2004 at 21:10

Tuesday, May 25, 2004 at 21:10
But which diesel engine does it relate to?

and when is part 2 comin out, sequals are never as good though
AnswerID: 60150

Follow Up By: Rob W. - Wednesday, May 26, 2004 at 09:36

Wednesday, May 26, 2004 at 09:36
I too, am interested as to which diesel engine it relates to, and what about that 1800 number?
Rob
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Follow Up By: Mrs Diamond - Wednesday, May 26, 2004 at 13:28

Wednesday, May 26, 2004 at 13:28
i think the article was refering to diesel engines in general.
the 1800 number didnt finish because some people might consider it as free advertising but some more numbers are 646988 lol
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Reply By: Member - JohnR (Vic) - Tuesday, May 25, 2004 at 21:51

Tuesday, May 25, 2004 at 21:51
Mrs Diamond, very interesting thinking. You and I may have thought that in todays knowledgable society they would have straightened out most of that by now.
Cheers,
Who?
John

Member
My Profile  My Position  Send Message

AnswerID: 60163

Reply By: Member - Toonfish - Thursday, May 27, 2004 at 01:10

Thursday, May 27, 2004 at 01:10
do ya reckon this may apply to me towing the patrol with the navara next week?
WHEN ARE THEESE PROBLEMS LIKELY TO OCCUR.
they may occur when the vehicle is pulling a heavy load or performing hard 4wd work and using a turbo.

no such thing as hard 4wd work just work is hard oh yeah and mounting erections apparently hey andrew?
AnswerID: 60362

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