Talk about scary!
The love of my life went in for its MoT today. I was confident it would pass with flying colours. I reported back to the MoT station just in time to observe the last stages of the test. You know the bit where they rev the nuts off the diesel to check the emissions and stuff. It was horrifying. My silky smooth 3-litre six screaming its head off - not literally, you understand - but enough to send shivers down one's spine. It passed; no problems.....but the engine now had a rattle on it, the like of which I'd never heard before. Angry and depressed, :cry: I drove gingerly back to work, accompanied by the dreaded tap...tap...tapping, and parked up. All afternoon I pondered the sixty mile drive home; A roads and motorways. Would the old girl make it. Got myself into quite a state my home time at 18:30hrs. It was dark and snowing. I didn't fancy breaking down one little bit. Carefully fired her up. Not an untoward sound. No rattle, no knock; silky smooth as always. Hmmm! Drove home. It went better than it ever has done before. Surged up the A3 out of Guildford and up on to the Hogs Back. No holding it. Snowflakes flying past; headlights cutting through the dark. Cut across to the M3 and away she went again....on to the A303....ever onwards. Snow stopped now...clear skies and stars twinkling. Flashed past Thruxton and hauled off into the lanes that take me home. Pulled up outside the house, the old 603 diesel purring like a kitten. Journey time almost as good as the Subaru's!
I'm a happyold fart again. So what was all that about? Is this what they call an "Italian tune-up"?
Q
P.S. Does anybody know which side of the block the oil pressure sender is located on the 603 engine? I suspect it's on the left, tucked away somewhere inaccessible. They usually are!
Q :lol:
Q, Enjoyed the trip home with you :) It's not a good idea to over rev with no load on the engine. If it was my motor then I'd be having a word with the mechanic or changing MOT station. Wonder if anyone ( job for Jesus ) knows the recommended test RPM. I always stay and watch the test on all my motors then if you get a cloth head you can keep your eye on him. Don't let some idiot f*ck up your pride and joy, let him know your not happy if he doesn't treat it with respect. I recall many blown and f*cked up diesels when they first introduced the emmission test especially the turbo's, then they recommended not over reving :shock:
Unfortunatly the MOT rules state that the emissions test must be done at max. RPM. There is also a condition of testing that the engine must be in a suitable condition for testing.ie if it blows up don't blame me!
My local station is run by a knowledgable guy who doesn't thrash it to bits.
I heard a story from the US board about 463s where the emissions test had to be done in gear at some speed. Tests were being carried out on 463s with the rear wheels only on a roller so the centre diff in the transfer box was being subjected to the worst possible abuse. It didn't take long to blow them up. People didn't realise they were constant 4x4.
The rattling sound may have been a hydraulic element in the valve arrangement. They are oil filled. Maybe the reving messed up the oil level in it.
The oil pressure sender is on the LHS viewed from the inside of the engine toward the rear of the engine under the inlet manifold. Its clear enough to see from above. Stick your head near the oil filter and look down.
I believe that engine cut-off is @ 5,150 (+- 50) rpm which is a lot.
I think that politicians in this country (bloody ignorants) hate diesels. If they had the faintest idea they would know that diesels pollute less than petrols and would be more amiable to them. Also if they were not in the hands of the oil lobby, they would remove all fuel duty in biodiesels (given that they pollution is NIL) as some modern countries in the continent have done, rather than in LPG. Shame on them.
Read with interest your experience of the MOT emission test!! OUCH!!
A few blown diesel engines and ensuing compensation claims stopped diesel emissions testing here in N.I. in its tracks!.
No emission testing here, despite the otherwise extremely rigourous computerised testing centres.
Surely revving to this extent with a disengaged flywheel, timing chain or otherwise, cannot be good for any CI engine?
Yours:
The diesel emission test was stopped for a while here in the early 90's. It's not a UK law law, it's EC.
Ec or otherwise, both my Merc Diesels were tested in January 2005,
No emission tests carried out.
Quercus, what a nice description of your way home - DC might just pay you to repeat it on the telly...
In times gone by I had similar experiences to yours with the diesel emissions testing. The key is to find a tester who has got sympathy for things mechanical... The kind of person who doesn't really need a torque wrench to know when a bolt is at the correct torque - the one who just loves engines - like you obviously and must admit myself as well do...
Found someone like that at a MOT test centre many miles away from where I am. And guess what, I drive past about twenty other test centres to his place. How does he test diesels? Like so: "Hello mate - oil service and cambelt change all up to schedule?" Answer yes, and then "Just give it a quick few revs - foot to the floor and off" Apparantly this way the engine is "working" to speed up the flywheel and not free-revving(the worst for any engine, petrol or diesel). I suppose this could even be a more effective test due to the enriching under accelleration.
Another possibility is something along these lines: When I used to be involved with quattro's, there was an issue about brake testing on rollers with only front or rear wheels rotating. A few test centres didn't believe us when we were going on about the 4wd system - I mean the rear tyres were making black marks on the concrete floor while the front wheels were rotating on the rollers... A few of us got together and got court summons sent to the offending parties for damaged transmissions and diffs - count about 10k per vehicle. Didn't take it any further, but brake testing from then on became a quick drive 'round the premises...
Really depends who you're dealing with - most of the time "look mate, I love this thing so please don't rev the nuts off it" will do the trick. If not, just tell 'em "you won't see me or any readers of my newspaper again..."
Martin,
Brief discussion on that subject here this morning , my car overdue for the test, opinion varied, some said yes , some said no , some said it depended on the tester! , this all based on experiences at Coleraine test centre.
See you Saturday,
Marcus
Insist... full working temperature before being thrashed?
If anyone thrashes my G I'll thrash them! :evil:
Hi Marcus,
My experience at Mallusk, however as long as the centre has been converted to run the MOT2 test, they are not- at least at this time, permitted to carry out diesel emissions.
Looking forward to Saturday,
Cheers
Martin
I wonder how effective emission tests on diesels are.
My wife’s VAG 2.5TDi recently passed its MOT with a knackered EGR (exhaust gas recirculation valve).
How do I know it was knackered? Well on full throttle who ever was following you would disappear in dense black diesel smoke :cry:
Passed MOT at a Ford main dealer.
how bizzare Russ.
I`m with you jesus the goverment really must make more of an effort with the bio,
it is common sense after all. something the goverment seems to be in short supply of these days. :?
JOIN THE GWOA
This website and forum are provided for the benefit of enthusiasts and owners of all Mercedes Benz off road vehicles, in particular the G Wagen. The costs of development, upkeep and provision of the site are met entirely by the annual subscriptions of club members. If you are using the site and are not a member of the G Wagen Owners Association please consider joining. You will have access to areas on the site that are not open to non members, to club trips and meetings and to technical assistance. In addition your contribution (only £25 annually) will help us maintain and develop our website for future users.
Who's new
- Jaffa_JIM_23
- Wrabstar
- GG
- KTMSCANIA22
- 280ge
Thank you Gentlemen, for the great response to my missive. You all echoed my own feelings on the matter. Actually, I've come to the conclusion that I have, just perhaps, been treating my old bus a little bit too gently lately. To get the best out of a G on the road you have to drive it "like an Austrian", i.e. "balls-out" all the time, using the revs to keep it on song (and to Hell with the fuel consumption :shock:) . This also blows out the cobwebs. Oh, and a good healthy dollop of Fuel Set additive helps too. I have obviously spend too many years in the distant past, chugging about in Solihull's products where max torque tends to be generated low down the rev range and gearboxes learn to be afraid.
Q
p.s Thanks for location of oil pressure sender.