TD42 OWNERS QUESTION

Vehicle modifications/repairs/rebuilds
User avatar
Ross
Senior Member
Senior Member
Posts: 313
Joined: 19 May 2009 13:41
Full Name: Ross Holland
Nickname: Ross
Home Town: Cape Town
Current 4x4: 1998 GU 4.2 Turbo Diesel
aka "The Polar Bear"
Home Language: English
Has thanked: 5 times
Been thanked: 9 times

Re: TD42 OWNERS QUESTION

Post by Ross »

Awesome Pieter, looks excellent!

:thumbup:
Ross

1998 GU 4.2 Turbo Diesel: 2" OME, 33" Big Horns, 2x LR Tanks, Safari Snorkel, Dual Battery, Drawer System, etc etc
aka "The Polar Bear"

User avatar
Pieter du Toit
Patrolman
Patrolman
Posts: 885
Joined: 06 May 2009 15:04
Full Name: Pieter Joubert du Toit
Nickname: PJ of ook Whitey
Home Town: Welgemoed
Current 4x4: 2002 Nissan Patrol GRX TD42T CONVERSION
Home Language: Afrikaans
Location: Cape Town
Been thanked: 1 time

Re: TD42 OWNERS QUESTION

Post by Pieter du Toit »

Hi all,

Well I can confidently and comfortably say that my Patrol's overheating problem is something of the past - I drove the living daylights out of it over the weekend over Sir Lowry's Pass to Pearly Beach and back - and not once did my heat gauge even once moved anywhere. :woo: :woo: QQQ :clap: Except for the rear main seal problem that developed now on the weekend everything else is fine.

The higest oil and water temperature that was recorded over the whole weekend was 97 degrees for both!!

My aircon is working like it has never worked before - I am sure that it did not even make that cold when it came new from the factory!! According to a temp gauge I had in the vents for the whole weekend the air coming in from the vents run anywhere between 0 and -2 - my wife complained yesterday on our way back that it is too cold in the car and had to put her jacket on!!! :woo: :woo: The aircon cycles nicely and there don't seem to be any problems - the condenser under the car stays cool and don't heat up that much as previously.

Now for the other problem.......my rear main seal :helpsign: See my post under engines in technical.

Regards
Pieter du Toit
MUFASA
2002 - 2010 Patrol 3.0L TDi GRX - HANDGRANADE WENT BOOM!!
2010 TD42T GRX CONVERSION - SADLY SOLD!!
Cell no: 082 803 5073
Fax no: 086 500 9333

User avatar
Peter Connan
Moderator
Posts: 5938
Joined: 10 Sep 2010 07:21
Full Name: Peter Connan
Nickname: Piet
Home Town: Kempton Park
Current 4x4: 1996 Patrol 4.5SGL
Home Language: Afrikaans
Location: Kempton Park
Has thanked: 549 times
Been thanked: 536 times

Re: TD42 OWNERS QUESTION

Post by Peter Connan »

Well done Pieter :thumbup:

Thanks for teaching me a few things here :salute: :salute:
Mag ons ons kenniskry met lekkerkry aanhoukry.

User avatar
Michael
Moderator
Posts: 2693
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 182 times
Been thanked: 305 times

Re: TD42 OWNERS QUESTION

Post by Michael »

Ok well it’s not always good to bring an old post to life again, but I think in this case it will be ok as the overheating problem on the TD42 will always be a problem. I would just like to share my findings and mods.

Here are my temps that I am running at. These are recorded recently on our hottest days

Highest EGT recorder doing 120km/h on a uphill with the engine giving it all and turbo boosting full at 0.7bar EGT was 560deg (this was my highest ETG ever, usually sits at 500 – 540 under load
Coolent temp where it exits the engine 78-84 deg town driving. Highest I got on the highway while towing around 3 tons was 92deg with the aircon on. My air condenser is in bad shape and it definitely restricts my airflow and gives off loads of heat, makes around 5deg difference on my heat gauge. My heat gauge needle doesn’t move, looks like its welded to just under half when engine is at normal operating temp.
My oil temp is not monitored at the moment as I broke the adapter but will be working soon.

1. Cooling system. The radiator plays the biggest role in the water temp and I found that the mods I have around my radiator is contributing the most in keeping my water temp down. I bought the Patrol with a 3core radiator as the previous owner obviously had serious overheating problems. My cowling is modded so that it seals properly all around the radiator and there is a square piece on the left side that has been closed off as well (there is a massive hole in it and I don’t know why). This helps in town driving to force more air through the radiator when the fan is doing its job.

2. Cooling fan. The visco on my fan is an aftermarket one that the previous owner installed that is about 80% locked. Its about as stiff as a visco when it kicks in, but it is like this all the time. Not contributing to the fuel economy, but makes a huge difference in the water temp.
I changed the fan once to another visco fan (think it might have been broken) and my heat gauge went to around ¾ mark on the first warm day. Even on the highway it was running hotter than normal. My fan also runs a bit closer to the radiator which seems like it pulls through more air.

3. Thermostat housing and thermostat. Here I think is another area which is sometimes overlooked. Now to start off, the thermostat housing on the TD42 is a bad design in my opinion and it is very restrictive. The second thing is that it uses a bypass thermostat system. This means that when the engine is cold the water is only circulating through the engine. Once the thermostat opens on its temperature (new here is the important part) it closes a channel so that all the water now goes through the radiator. The important thing here is that the thermostat must seal 100% on the channel it blocks when it openes. The better the seal, the more water it passes through the radiator. When it doesn’t seal properly it still circulates some of the water back through the engine and not the radiator.

I have modified my thermostat housing using an old thermostat. I grinded off the bottom sealing part of the old thermostat and stuck it on the inside of the housing where the thermostat needs to seal. This creates a 100% flat surface that is made of stainless steel and seals 100% when the thermostat is open. I unfortunately do not have a photo of this.

The sealing area inside the housing is also sometimes very corroded when the previous owner haven’t been running the car with anti-freeze and will then not work correctly!! I will recommend everyone with overheating problems to inspect their thermostat housing for corrosion.

The thermostat is also very important. I bought a genuine Nissan thermostat (not that I think the aftermarket ones are not suited for the job) and bought a specific one. Mine opens on 76.5 degrees (Part number 2120058G04) and I think this is a bit lower than the standard thermostat.

4. Engine bay. The engine bay in the 4.2d can become very hot and I have tried to keep mine as clean as possible. This is not easy when you have a top mount cooler, duel battery, air compressor or any other item under the hood as you need all these things. Thus I have installed a front mount cooler which I think helps allot in keeping the engine bay cooler. I also think the hot air can escape much easier when there are less things under the hood.

5. Engine mods. Now here I am not sure if this helps at all but the possibility is there that it does contribute. I have done a gas flow on my cylinder head when I built the engine. I have made my intake and exhaust ports as smooth as I could get it (took me 2 days with a air tool and buhr). I have also matched my intake and exhaust manifolds with the head to make sure the air can get into the engine easier and get out as quick as possible.
The snorkel and 3” free flow exhaust also helps a bit I think.

Just my 2cents
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

User avatar
ricster
Patrolman 1000+
Patrolman 1000+
Posts: 6434
Joined: 13 Jan 2010 11:16
Full Name: Cedric Warner
Nickname: Cedric
Home Town: Alberton Gauteng
Current 4x4: '99 Nissan Patrol 4.2 Turbo Diesel
Home Language: English
Location: LA..... No not Los Angles ..... Lower Alberton, Gauteng
Has thanked: 382 times
Been thanked: 360 times

Re: TD42 OWNERS QUESTION

Post by ricster »

Good points there Michael !!!
Regards
Cedric
Nissan Patrol GL 4.2 Diesel Turbo (Iron Maiden)
Nissan SANI 3.0 V6 4x4 (SOLD)
Isuzu KB 280 DT 2x4 ('ol Smokey) - SOLD
Suzuki TL 1000R "V twin" (Growler) - SOLD

User avatar
Tinus lotz
Moderator
Posts: 7826
Joined: 29 Aug 2010 13:07
Full Name: Tinus lotz
Nickname: Tinus lotz
Home Town: Centurion
Current 4x4: Nissan patrol 4.8 GRX 2005

Toyota 2.7 legend 35 LWB 4X4
Home Language: Afrikaans
Has thanked: 671 times
Been thanked: 422 times

Re: TD42 OWNERS QUESTION

Post by Tinus lotz »

All those things together. ...works well i love that green machine. ....

Post Reply

Return to “16. DIY Projects”

Who is online

Users browsing this forum: No registered users and 1 guest