300TDi overheating

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andrewMcF
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300TDi overheating

#1 Post by andrewMcF » Mon Jul 16, 2018 10:54 am

Daily driving I have no issues with heat. With the thermostat in it would anchor in at 93C and not even budge. However while driving to and from the BCOR the tuck overheated several times dumping all of its water, but only on the big ugly hills while doing 100-110K/h, I was able to keep the temp down if I drove 70-80K/h but the engine has the power, quite happily to go faster but the cooling is an issue...

exMOD Defender 110
Disco 300TDi
LT77
Roamer Drive
electric fan(pulls air through the rad)
35+C outside
Thermostat removed

So some have suggested an coolant flush... Anyone have success with such a process? Do it myself or get it professionally done?
New radiator? Mine holds coolant but maybe its time for a new one with less crap in it? They're relatively cheap.
A new high capacity one? Allisport is very expensive and they are on back order... but not as expensive as a new engine.
Do add a second fan that runs at a higher temp(pushes air through the rad)
Put the old mechanical one back on? with the engine configuration it's pretty far away from the rad...

I want to be very comfortable that I'm not going to cook off my engine.

Looking forward to everyone's thoughts.

Thanks,
Andrew
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

red90
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Re: 300TDi overheating

#2 Post by red90 » Mon Jul 16, 2018 11:40 am

Overheating with the tstat removed or only with? The thermostat should not be removed as it includes a bypass valve, that shuts the bypass flow, forcing all the flow through the radiator. If it is out, you need to also somehow shut off the bypass flow.

Especially with a custom conversion, it is really hard to help narrow the problem as there are many things that could be done wrong with the conversion or it could simply be one bad component. A factory stock system in proper condition should never overheat. I've run with a loaded trailer and truck through every major pass in BC without ever going over 95 C. I also lived in Australia for a few years and never once recall anyone overheating their TDI. Long drives up mountains in 45 C with the A/C on full blast were common.

- Make sure you have a good working tstat.
- Check the pump. 300TDIs have a crappy little pump that is mounted too high. It is a bad design, so it needs to be in proper condition.
- Take the rad to a rad shop and have them flush and flow test it. Don't get new. Get a recore. Rad shops do a better job and new replacements are not very good. Unless you really want a nice Alisport one.
- What is the electric fan install like? Is it properly shrouded to the radiator? How big is the fan? Are you sure it is running?

andrewMcF
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Location: Kelowna

Re: 300TDi overheating

#3 Post by andrewMcF » Mon Jul 16, 2018 11:55 am

Hey Red90,

Thanks for the response...

the tstat is maybe 2 years old.
pump is a new britpart pump, less then a year old
the electric fan was definately running, it's a bit loud and is this fan https://www.steveparkers.com/product/da ... i-suction/

I'll put the tstat back! I was figuring that the flow would help... thanks for the tip!

Next logical step is off to the rad shop and have them look at it and test it.

Thanks,
Andrew
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

red90
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Re: 300TDi overheating

#4 Post by red90 » Mon Jul 16, 2018 12:25 pm

I've not really looked into the BP pumps and if they are okay, but might be worth investigating if an OEM one is any better. They do not look to be too expensive. If you pull the rad, might as well pop the pump off and see if it looks okay.

The fan looks okay.

andrewMcF
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Re: 300TDi overheating

#5 Post by andrewMcF » Mon Jul 16, 2018 12:56 pm

Swung by a rad shop at lunch. If I pull the rad they'll look at it tomorrow. He figures probably bad flow based on the color of the new coolant, Mississippi River brown, but of course won't know until he tests it.

Thanks for the suggestions. I'll post the results.

Andrew
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

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rgallant
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Re: 300TDi overheating

#6 Post by rgallant » Mon Jul 16, 2018 2:09 pm

Flush your engine while the rad is out, pop your thermostat out

Set your heater to maximum hot

Garden hose LOW pressure may 1/2 to 3/4 turn of the tap,you might need more but not a lot. My Disco V8 took about 2/3rds of turn to get good flow.

Start with the top hose and let it run until it clear, then the lower hose
Do this about 3 times

Just put the garden hose into the rad hoses you do not need a lot pressure just water flow

The water should come out nice and clean.

Then you are ready to fill her up when then rad get's back.
2004 Discovery - stockish

andrewMcF
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Re: 300TDi overheating

#7 Post by andrewMcF » Mon Jul 16, 2018 2:51 pm

rgallant wrote:
Mon Jul 16, 2018 2:09 pm
Flush your engine while the rad is out, pop your thermostat out

Set your heater to maximum hot

Garden hose LOW pressure may 1/2 to 3/4 turn of the tap,you might need more but not a lot. My Disco V8 took about 2/3rds of turn to get good flow.

Start with the top hose and let it run until it clear, then the lower hose
Do this about 3 times

Just put the garden hose into the rad hoses you do not need a lot pressure just water flow

The water should come out nice and clean.

Then you are ready to fill her up when then rad get's back.

Will do!! Thanks.
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

red90
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Location: Calgary

Re: 300TDi overheating

#8 Post by red90 » Mon Jul 16, 2018 3:54 pm

You should be able to put full hose flow through the heater. There is no valve in it. Make sure you pull the block drain on the engine and flush it out well.

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rgallant
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Re: 300TDi overheating

#9 Post by rgallant » Mon Jul 16, 2018 5:25 pm

red90 wrote:
Mon Jul 16, 2018 3:54 pm
You should be able to put full hose flow through the heater. There is no valve in it. Make sure you pull the block drain on the engine and flush it out well.
Did not know that - I prefer to err on the side of caution though so I still go pretty easy on the water pressure
2004 Discovery - stockish

andrewMcF
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Re: 300TDi overheating

#10 Post by andrewMcF » Wed Jul 18, 2018 12:43 pm

Update,

I didn't bother to pull the rad and have it flow tested, however I did do a manual flush with the garden hose on the block and the radiator... It came out clean, no discoloration other then some antifreeze... I suspect that maybe the whole boil off and purge of water on the side of the road dumped a lot of the sediment out...? the water that was in the reservoir was gross brown in colour not green when the boil happened and that anti freeze was less then a year old.... Put the thermostat back in, thanks Red90, and took it for a hard spin up some hills, nothing like the Coquihalla, and it seemed fine... I'll take it out for a hard drive up a big hill on the weekend and post the results here. Drought Hill outside Peachland should do it.

Andrew
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

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rgallant
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Re: 300TDi overheating

#11 Post by rgallant » Wed Jul 18, 2018 1:19 pm

Good luck !
2004 Discovery - stockish

VA7ZD
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Re: 300TDi overheating

#12 Post by VA7ZD » Sat Jul 21, 2018 11:29 pm

Just a thought. I have seen the lower rad hose (water pump suction) suck flat. It would only happen at high rev. At lower rpm all was good. It was just dumb luck that I found it to be the culprit, I was jazzing the throttle and just happened to see the hose suck flat as the engine revved up. On that particular vehicle these was supposed to be a coil spring on the inside of the hose but it had rusted to nothing.
You might want to make sure your hose isn't the problem, sounds like you have checked about every thing else.
Ian

andrewMcF
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Re: 300TDi overheating

#13 Post by andrewMcF » Mon Jul 23, 2018 7:47 pm

VA7ZD wrote:
Sat Jul 21, 2018 11:29 pm
Just a thought. I have seen the lower rad hose (water pump suction) suck flat. It would only happen at high rev. At lower rpm all was good. It was just dumb luck that I found it to be the culprit, I was jazzing the throttle and just happened to see the hose suck flat as the engine revved up. On that particular vehicle these was supposed to be a coil spring on the inside of the hose but it had rusted to nothing.
You might want to make sure your hose isn't the problem, sounds like you have checked about every thing else.
Ian

I'll check that! New hoses when the engine went in last year and there was no spring in that hose, cause I cut it to insert a coolant heater...
Also discovered my P gasket is leaking! Damnit! I replaced that when I put the engine in... sigh.
1991 exMOD 110(Daily driver) 300TDi
1967 88" parter(gone)
1965 88" 2,25 Diesel (Retired daily driver)
1962 109" 5 door(Sold)

bf900
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Re: 300TDi overheating

#14 Post by bf900 » Thu Aug 02, 2018 8:27 pm

I'm going to piggy back off this post as it's related to what I experienced this weekend but not to the extent of andrewMcF.

I upgraded to an Allisport Uprated Intercooler + new silicone hoses.
Installed a EGT Temp Gauge and new VDO gauges all around.
I carefully tweeked the fuel pump to provide a bit more fuel. Max Boost is at 14bar.

However, I never had a chance to fully test the 97 Land Rover 300tdi in super hot conditions...or up serious hills until this past weekend.

Three passengers + dog + paddle boards on roof (ie drag) + about 300 lbs in gear in the back. Drove up into the Cariboo through Rogers Pass / Cache Creek where it was 40c.

Showing 2800 RMP, 5th gear, about 100 kph up long hills, the egt temp hit 1100f (once)...the VDO water temp hit 100c maybe 102? as soon as power was off or down hill the water temp would go back into the mid 90s range. This would repeat itself depending on hill etc. I tended to lay off the throttle to keep the EGT temp no more than 1000f.

On the way back...hwy 1 west bound, 2800 RPM / 110 kph indicated but 101 on the GPS, EGT at 800f stable with water temp in high 90's.

I had never seen the water temp pass 100c and was getting nervous...and never pushed it much past that because due to the crazy heat outside and the family in the truck, I did not want to blow a hose, or overheat.

Ive since been looking for normal operating temperature of a 300tdi...does anyone know? Is 100, a slight nudge pass 100c on the gauge ok?

Should I be concerned with the odd 1100f EGT temp? Have read that 1300F is the MAX... any issues with these EGT temps?

Thanks

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