AnswerID: 301807 Submitted: Saturday, May 03, 2008 at 09:42
Thermoguard Instruments
replied:
Hi James,
My two cents worth: Don't rev it too high for the first few thousand kms but DO use full throttle and full boost at medium rpm (1500 - 2500). Giving the engine full cylinder pressures is good for properly bedding-in the piston rings and cylinder bores.
If you have to do a long trip in the first few thousand kms, vary the engine speed and load often rather than sit at steady rpm for hours on end. For example, if traffic conditions allow, back-off and coast down to 70 or so then give it full boot back up to 100 (without using max rpm).
Please don't try to warm it up by long idling. Whether it's brand new or has 300,000 km on it, long idling is bad for a diesel, especially when
cold. And it won't actually 'warm-up' appreciably by idling from
cold. Start it up, give it a few seconds to get the oil flowing, then drive off, keeping the load and rpm moderate until the temp gauge starts to move up a bit.
DO give any turbo-charged engine a couple of minutes if idling after highway or high load driving. I don't want to re-ignite the turbo-timer debate but I let my pre-turbo exhaust gas temp drop to the low 200s before switching off. For around town driving this usually takes about 1 minute but after pulling off the highway when towing it can easily take 3 - 4 minutes for the temps to fall back to a reasonable level. This may not be quite so important for turbos with water cooled centre bearings (what does the Mazda/Ford have?) but is still good practice IMHO.
Ian
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