From: Andrew Grafton (A.J.Grafton@lut.ac.uk) Subject: Diesel emissions, running in, etc. Date: Fri, 21 Jul 95 10:51:01 BSTA little data about our adventures with our 2.286 diesel 5 bearing.
Background ; engine blew up trying to pass MOT test and was rebored 40 thou oversize, had new pistons and bearings etc. Also, recon injectors and good dist. pump fitted.
We have now almost completed running it in and here is some data which may or may not be useful.
0 miles - engine very smoky. Filled it with 15W40 diesel oil, not 20W50 as we wanted it to run in 'quickly'... Injection timing adjusted to be late to reduce load on engine in first stages.
30 miles - blue smoke almost gone. Lots of white smoke from retarded timing. Advanced timing a little. Lots of black smoke on acceleration. Tappets needed adjusting.
200 miles - engine starts to develop a bit more power. Advanced timing almost to correct setting but not quite. Still shedloads of black smoke on accelearation, but less and less white at idle (none when warmed up). Tappets needed adjusting (again), but engine is starting to loosen up and give more power easily.
450 miles - changed oil to 20W50. Quite a lot of crap in oil filter housing, despite engine being stripped totally and pressurewashed with steam/paraffin/ steam/duck oil. Smoke tested giving a reading of 10 (irrelevant units), which dropped to 8 (irrelevant units) after 6 tests. Tested at 3000 rpm peak. Tappets adjusted again. Head bolt torque checked. Engine sounding really nice.
800 miles - Tappets adjusted, timing advanced to correct setting. Smoke readings taken as before, started at 4 and dropped to 3.1 after the mandatory 6 tries. Will pass MOT on that basis. Engine is now saying 'drive faster' - a whole new experience in diesel LR ownership!
And that brings us up to date...
So - if you have to rebuild your diesel, try and do it at least 1K before the emissions test (and limit it to 3000 rpm for the test).
Not sure if anyone is interested in the above, but there it is anyway.
All the best,
Andy A.J.Grafton@lut.ac.uk
From: Andrew Grafton (A.J.Grafton@lut.ac.uk) Subject: MOT test for diesels to change (2nd go) Date: Fri, 21 Jul 95 11:44:04 BSTIt's just come to my attention that the diesel MOT emissions test will change on 1 September this year, vastly for the worse re: LR diesel engines.
The method of testing remains the same (it will still be a load of crap, testing the wrong things), but the values of smoke opacity will have to be even lower.
Engine Was Will be Normally Aspirated 3.2 2.5 Turbo or other mods. 3.7 3.0The units are irrelevant as they do not exist in the real world.
I'd suggest that if your MOT is running out and your engine is smoky, that you get a test before Sept. 1 when the goalpoasts move again.
The changes only apply to vehicles first registered after August 1, 1979. Earlier vehicles are still subject to the same tests they were before (lucky buggers).
The above is just in case there is anyone else out there feeling victimised...
All the best,
Andy, A.J.Grafton@lut.ac.uk