[sijuko]

Originally Posted by Emvi

I suspect it might be a case of cracked/blown cylinder head gasket. I suggest you to get it checked and if it indeed is what I am suspecting, chances are high that the cylinder head might be distorted or damaged as well. We had a couple of Peugeot powered Mahindras before and have experienced similiar issues as the one you are currently dealing with. If for some reason the engine overheats, the aluminium cylinder head (correct me if I am wrong) has the tendency to distort rather easily. Once distorted, the engine overheats quite frequently accompanied by loss of power when heavily loaded or climbing inclines.

Engine was fully overhauled 3 months back with new sleeves,rings,piston and head was leveled and also head gasket was replaced..got new oil pump as well.I don't have any water loss or oil loss..I am assuming it has to do something with the fan not blowing or sucking the heat.

[pram_ind]

Originally Posted by Ashley Nair

Please check if the engine thermostat valve is properly opening.

+1 to that. OP might be using a high temp thermostat which might be opening late. Had the same issue with my cousins MM550.

[Ravi Parwan]

Originally Posted by Ashley Nair

Please check if the engine thermostat valve is properly opening.

Totally agreed, the thermostat valve might be restricting the water flow. Normal operations might not cause problem, but when the demand from the engine goes up, it shows up as an overheating problem.

[sijuko]

Thanks for all the experts openions,I have added a condencer fan infront of the radiator (Yet to test) and next plan is to seal the shroud,just waiting for the right meterial.

[dhanushs]

Originally Posted by sijuko

Thanks for all the experts openions,I have added a condencer fan infront of the radiator (Yet to test) and next plan is to seal the shroud,just waiting for the right meterial.
Attachment 2277674

Attachment 2277675

Hi, saw this thread late. So, has the additional fan solved the problem?

Assuming everything is OK in the engine rebuild part, I strongly think the overheating is because of an inadequate radiator/ or wrong diesel pump timing and fulling.

Worst case, it could be a cause of bad machine shop job on the fragile Aluminum head, which is so prone to warping. Additionally, a wrong size head gasket can also cause this issue.

[sijuko]

Originally Posted by dhanushs

Hi, saw this thread late. So, has the additional fan solved the problem?

Assuming everything is OK in the engine rebuild part, I strongly think the overheating is because of an inadequate radiator/ or wrong diesel pump timing and fulling.

Worst case, it could be a cause of bad machine shop job on the fragile Aluminum head, which is so prone to warping. Additionally, a wrong size head gasket can also cause this issue.

Hi Dhanush- I didnt get a chance to try out the new setup. I have no doubt on engine rebuild part as they are pretty famous guys in doing the engine rebuild.

I also wanted to get the diesel pump timing. Do you know if it can be adjusted without removing it ? Obviously I am not going to touch it.

[amit_purohit20]

What you can try:-
1) Replace or remove thermostat
2) Replace fan with a bigger and wider one
3) Change the fan pulley ratios to make the fan run faster. 1.6 is the ideal ratio. If its already there then no use changing it.
4) Better water pump or pulley ratio change to increase flow
5) Removing scales in Engine water jackets using acid..
6) Using better radiator preferring copper over aluminium and with a higher fin density per inch. One with more tubes
7) Check Engine gasket, presence of bubbles in the system
8) Radiator cap with higher pressure rating.
9) Use 50:50 percent Water to Coolant ratio
10) Use of additional electric fan

[dhanushs]

Originally Posted by sijuko

...
I also wanted to get the diesel pump timing. Do you know if it can be adjusted without removing it ? Obviously I am not going to touch it.

Yes, adjusting the pump timing and fuel isnt a biggie. A half days job, at the max.

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Ideally a Peugeot engine does have a lot of error margin w.r.t radiator, shroud etc..etc .. The fragile AL head though is very troublesome. The gasket doesnt last at all. Please make sure that part is also OK.

[sijuko]

Finally upgraded to have some relief from thse heating issues, hoping for the best

Question to all experts - How to identify the exact model and year from an engine?

[DirtyDan]

Cheap things to try:

1.) New thermostat.
2.) New radiator cap. B.D. was adamant about this.
3.) Check your new radiator to make sure it has NO protective coating on it
still, from the factory....been there, suffered thru that!

4.) Slipping fan belt...yeah I know but check it again.

[MB4DI]

Originally Posted by sijuko

Finally upgraded to have some relief from thse heating issues, hoping for the best

Congrats, I hope you are enjoying the torque of DI.

No more heating, just peace of mind.

Regards,
MB4DI

[BareMech]

Posting here as this topic revolves around a MM540 and its cooling system.

I have got an XDP 4.90 engine, whose thermostat valve has long been removed by our mechanic, citing blockage concerns.

As this vehicle is used for trips with very frequent stops- the thermostat's absense has caused it to lose temperature in very short spans of time, requiring a glow plug heating for every subsequent restart.

To address this, I went searching for an XDP 4.90 thermostat, but couldn't find it anywhere. Since it's a non essential component with close to zero demand, no shop I enquired in Bangalore had got it.

Of late, I managed to find a thermostat valve for the XD3P engine- but not sure if it would fit in the housing on the XDP 4.90.

Can I try using this XD3P thermostat?

Also have a similar predicament about the thermostat on an MDI-2500. No thermostat available for this engine too. Could the one from the MDI-3200 TC fit?

The question seems too irrelevant, but could hold the solution to batteries being drained too frequently on the XDP 4.90 stead due to regular use of glow plugs.