Team-BHP - Overheating problem in Jeep

Quote:

Originally Posted by Samurai (Post 983509)

Still running-in, can't take it to Agumbe ghats yet. No over-heating on regular roads.

thats nice to hear, hope your efforts bear fruit!

BTW, yesterday, i almost ran my 540 without water for 40 kms..I noticed that the temp climbed to 100 deg C but no signs in loss of power etc.

Being the lazy guy that I am, i just drove on to my home from work. This morning the radiator consumed almost 5 litres of water.

Oh, forgot to mention, that i converted the radiator to pressurised cooling system with a remote resourvoir..the coolant in the resourvoir was full while the radiator was half empty. Maybe that explains that the closed loop cooling system is not working as expected and I Need to CHANGE the cap.

Your issues came to mind while i saw my temp needle at 100 :D

I have a 1996 Mahindra Classic. I own this vehicle for the past 5 years. Initially I used to off-road extensively and then scaled down.

At present I am having issues with the Engine. Around two months back I did an overhaul of Wheel Disc and Brake system on all the four wheels of the Jeep. For the last 6 to 8 weeks I observed that the Jeep is over heating. Earlier in city the Jeep engine temp used to be at 80 C. But off late even with-in short distance (3 to 4 KMs), the engine temperature crosses 100 C. Last week I serviced the radiator and also changed the top and bottom tanks in the radiator. But the problem still exists.

Request the advise of the gurus in this regard.

I really want to have some good (expert ) opinion here . This is based on my Knowledge of engines .

These issues I am discussing here are apart from the functioning of the cooling system .

I always had few doubts & questions regarding the issue .

1# Taking for granted all other mechanical wear is within limit , How far the worn-out compression rings would cause overheating, by means of hot expanding gasses from above the piston top leaking in to the crank case/ lower block ?

2# How far cam wear would affect the ambient temperature ? Is Opening & Closing timing of exhaust valve wrt crank degrees crucial here ?

3# How far worn-out timing gear thing ( chain, sprockets or idler gear bush ,gear wear ) would affect ambient temperature ?

4# What are the effects of shaving of head ( within or beyond limits -- what are they ? ) affect/effect temperature ?

5# How far diesel starving is an issue wrt overheating ? Is it really an issue wrt temperature ?

6# Will an unbleeded distributor pump cause overheating ?

7# Is there any base for the belief that clogged air filters cause overheating ?

Sudarshan

To add to my above post , I have observed that modifications done to exhaust systems & or pipes , do cause or lead to overheating also.

I also want to make sure if fall in back pressure lead to temperature rise ?

Sudarshan

P S . Bit surprised by the lack of response to the query. Either its a trivial issue, or answers are too far to fetch .

^^^
Anything which reduces power for the same throttle position will have some adverse effect on temp. Except timing changes (which can have large effects) most should be marginal.

Am assuming the FIP has not been fiddled with. And injectors are fine.

Leaking combustion gases can have major bad results (blowtorch effect) but unlikely to show up on the temperature gauge.

Regards
Sutripta

Quote:

Originally Posted by Sutripta (Post 3106127)

What if such things pile up & make a 20 % effect ?

Quote:

Leaking combustion gases can have major bad results (blowtorch effect) but unlikely to show up on the temperature gauge.

YES ( SSSS ) that was the word I was looking for, Blow Torch effect ! But why you say its not significant ?

Thinking & thinking & thinking over this for a long time, but not having anything conclusive .

Sudarshan

Quote:

Originally Posted by Sutripta (Post 3106160)

Did not say 'not significant', but 'unlikely to show up on the temperature gauge'.

Regards
Sutripta

OK Sir I construed wrong, but again why you feel its 'Unlikely' to show up on the temperature gauge ?

I think it will show because .

1) It will lead to the rise in temperature of the lower part of the block .

2) Rise in oil temperature .

3) Heating of the cylinder walls & piston ( lower side particularly )

These would not have caused, if the rings were in good shape & confine the hot gasses to the upper part of the engine .

Sudarshan

Quote:

Originally Posted by Sutripta (Post 3106816)

So how about an experiment. Rigorous. Statistically valid. With control.

Regards
Sutripta

Sir I dont have such facility with me. All I can do is to think, based on previous & ask some doubts to people like you who have more knowledge than me .

This is just an effort to sort out issues which are in front of a common Jeeper .

Sudarshan

Quote:

This is just an effort to sort out issues which are in front of a common Jeeper .

I thought you had a LandRover!

Theorising needs validation.

The jeepers overheating problems should have been sorted out at the factory! Not by tinkering at the user level.

Or form an users group, tackle it as an engineering problem, and reengineer what is necessary. The reason why it is not done is
It is not cheap. (certainly not for individuals)
It is not quick.
The whole community has to have faith in the engineering team. (Significant money will be spent before ANY results are seen.)
It will (should) benefit all those who supported it, rather than a select few.

Regards
Sutripta