Member Since: 29 Jun 2013
Location: Croydon
Posts: 73
Cooling after a long run
I'm sure I read somewhere that it's always good to allow a diesel engine (or any engine?) to cool off after a long run. By that I mean to allow it to idle when stationery for a minute to dissipate heat that has built up? I'm not sure if that's still the case with modern engine's - if you've charged across the country at break neck speed do you need to sit outside the house for 60seconds to allow it to cool down before switching off? I would have through it would have gotten hotter doing that??
26th Jul 2013 10:13 pm
fishinmad
Member Since: 30 Jan 2012
Location: St Ives
Posts: 877
In the handbook it says allow to idle for 30 seconds-1 min on starrt up and the same before tuning it off after a long run (both to do with turbo).Club Narpy Torch
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26th Jul 2013 10:18 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20818
It helps prevent heatsoak, and prevents the oil vapourising inside the turbo housing (which leaves a coating of carbon on the turbo bearings IIRC)
The RRS S/C has an auxiliary coolant pump, which pumps coolant around the engine for a while after the car has been switched off for heatsoak issuesMy D3 Build Thread
Member Since: 27 Mar 2012
Location: Wess vinglun
Posts: 93
I'm amazed at how much heat comes off of the front of mine after a drive. Never noticed it with the D2 or my other car (which is also a V6). Is this a D3 feature or something for any large TD engine?with a occasional Bailey Unicorn Valencia tintent
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28th Jul 2013 6:40 pm
bigdave Site Sponsor
Member Since: 04 Jul 2008
Location: Cornwall
Posts: 9870
I've always let Mine idle for 30-60 seconds before and after any drive.
always done it to protect the turbo.
I've also always driven it very hard once or twice a week to get it to clear out the engine and turbo
Not a tech but its habit now.
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Member Since: 23 Sep 2012
Location: Lincoln
Posts: 1094
It really is only for turbo cars to protect the turbo from oil starvation. If you're thrashing the engine and the turbo is spinning at 100,000RPM, the last thing you should be doing is turning the engine off. The oil stops being pumped into the turbo bearings causing lack of lubrication. Spinning at 100,000RPM with no oil is not a good idea.You guys are gonna be busier than a test bench in a plunger factory!
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28th Jul 2013 9:30 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8197
It isn't necessary to sit with your engine running unless you have made an unexpected stop after high speed driving i.e. a traffic jam on a motorway. Far better to drive the last 1 or 2 miles of you journey at a cooling speed, the engine will cool down far faster whilst you are traveling than when stationary, a lot of this will happen naturally because of road conditions, i.e. built up areas, speed limits, parking etc. The temperature of an engine will in fact increase when stationary after a long hot drive , particularly in your location. Some makes of cars with electric fans will still have the radiator fans running after the car has been parked and locked up.
The same applies with starting from cold, on vehicles fitted with turbos only 50% of engine power should be used until the engine is up to working temperature, this again in most cases happens naturally because of road/traffic conditions. Engines that are not driven as above will be the first to suffer premature turbo failure, hence the advert your engine wears more in the first 3 minutes after start up than at any other time.It can when others can't,
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Some vehicles are now being fitted with electric water pumps extra to the standard fitted water pump to keep the water circulating after switch off to avoid hot spots.
28th Jul 2013 10:16 pm
Bushwanderer
Member Since: 27 Nov 2007
Location: Northern Rivers, NSW, Australia
Posts: 2050
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, particularly in your location. Some makes of cars with electric fans will still have the radiator fans running after the car has been parked and locked up.
