Thread: does a PUMA need running in

I am sure you will get a range of opinions on this issue. However, the owner manual says (in summary) that during the first 800 km limit the max engine speed to 3000 rpm and max road speed to 80 km/hr (from Defender Owner's Hanbook 2007, which came with my 2010 D90).

Cheers
KarlB

Originally Posted by newhue

Hi guys,

Do these new diesels need running in for X number of KLm, or just drive it?
I pick it up next week and was thinking of going for a long 80-90klm/h drive along the highway.

thanks
Jason

IMHO a steady run up the freeway is about the worst way you can go about running in an engine.

Fire it up, drive if steady til its warm and then use it a bit - not flog it but not baby it either - pressure seats rings and avoids glazed bores. The engine will let you know how far to take it - don't rev it til it feels really harsh.

Dealership told me to vary speed between 80 and 100....not to stay on one speed for long periods of time for the first 1000klm

Constant hwy speed = bad for running in engines

my rough rule of thumb for running in engines is to keep it on city cycle running during the run in period.

dont let it sit at one rev band for too long, change gears but maintain speed if you need to.

dont use more than about 2/3 of the throttle.

as you exit the run in period use more throttle.

Here's another opinion.

http://www.mototuneusa.com/break_in_secrets.htm

Originally Posted by P38ace

Here's another opinion.

http://www.mototuneusa.com/break_in_secrets.htm

That's the method I have used to run in my motorbikes and I've never had an issue with it. I know many others who have used this method and it seems very popular across the board..

As others have said, staying the the same rev ranges, speeds and having a constant load on the engine for long periods of time is considered one of the worst ways to break in an engine

I agree with the other posters here - please do run it in, and do so by varying speeds and gears - live Blknight says - city driving is actually ideal. A long cruise on a motorway isn't. The engine will continue to free up over at least 20,000km.

Then you'll also want to "break in" the transfer case - the more you use it, the smoother it will become.