The Good and the Very Bad!!!

daygoboy

Free Member
The Bosch Diesel Network site will turn up service centres that
at a guess will do a postal service. Probably wouldn't be wasted
money because you could give them the go ahead to service the
things any way set the spray patterns, ultra sonic clean up
maybe a new nozzle or 2. Saves buying 2nd hand unknowns.
Your eng. sounds sweeter than my 4L Merc. TBH!
 

linkshouse

Full Member
The Bosch Diesel Network site will turn up service centres that
at a guess will do a postal service. Probably wouldn't be wasted
money because you could give them the go ahead to service the
things any way set the spray patterns, ultra sonic clean up
maybe a new nozzle or 2.
I didn’t know about the Bosch Diesel Network. There’s an agent in Aberdeen. I'll give a shout...

Saves buying 2nd hand unknowns.
Absolutely, but...

I wish I’d seen your comment 5 minutes earlier.

SWMBO told me to stop faffing about and get them ordered!

So, good bad or otherwise, they’re on the way.

Your eng. sounds sweeter than my 4L Merc. TBH!
Well, that’s encouraging 😁
 

daygoboy

Free Member
Sorry about that. 5 minutes eh? Never know one day you up there, might
have the advantage of being 1 hour ahead of us down here !
 

Vanterrier

Full Member
Send the ones you just bought off ebay to bosch and if they say they are duff send them back for refund. If they are ok get bosch to service them and you then have known gooduns.
K ;)
 

helen262

Full Member
Have you tried retarding the fuel pump ? My David brown 880 used to have a diesel knock until I retarded the pump, it only moved about 1/8th of an inch to cure it. Failing that when you have it running just crack open each injector pipe one at a time to see if it stops the knocking if it does then you know which is the worn injector.
If none of them cure it then it could be the pump isn’t retarding or the cold start is stuck open
 

linkshouse

Full Member
I thought I’d had a breakthrough this morning.

It turns out the mechanic that works at the salmon farm where my son works, has an injector test rig!

I borrowed that and tested the injectors. Three were producing a proper injector spray pattern, the fourth was just a straight stream of diesel.

Result!

Stripped down the offending injector and the pintle would budge. Bit of heat and gentle coaxing got it out. Cleaned it up with some fine t-cut and got it sliding freely in the nozzle. Re-assembled and retested, getting a proper spray pattern then.

Put the whole lot back, fired up the engine and...

Still the same! Well slightly better, maybe, I think... Not the ta da moment I was hoping for 😭

I’m starting to get a bit exasperated with this now 😒

I’ll maybe try helen262’s suggestion with the timing, once I figure out how, but can’t see why that should have moved.

My wife is adamant that it only started doing this (before the cam belt breakdown) after we’d had a new exhaust fitted, but it is hard to see how that could be related.
 

helen262

Full Member
It sounds like your timing is correct but could possibly need to be retarded slightly,
Have you tried cracking open the diesel pipes one at a time to see if the knock goes away especially on the injector that has shown to be faulty
 

linkshouse

Full Member
It sounds like your timing is correct but could possibly need to be retarded slightly,
Have you tried cracking open the diesel pipes one at a time to see if the knock goes away especially on the injector that has shown to be faulty
Yes, tried each one in turn and the engine slows but the knock remains.
 

helen262

Full Member
Have you run it up to temperature? If so and it still knocks then either the pump is too far advanced or the cold start is stuck on
 

linkshouse

Full Member
Have you run it up to temperature? If so and it still knocks then either the pump is too far advanced or the cold start is stuck on
Yes I have run it up to temp.

I’m not sure how to retard the pump, or investigate the cold start.

Do you have any suggestions or web links?

Thanks
 

helen262

Full Member
Yes I have run it up to temp.

I’m not sure how to retard the pump, or investigate the cold start.

Do you have any suggestions or web links?

Thanks
I am struggling to find anything on the internet, and the Renault was a van I always used to stay clear of, but older diesel were a lot simpler to work on than modern diesels.
And in the past I have bought knocking diesel vehicles cheap from the auctions as many were put off by them as they couldn’t tell the difference between an engine knock and a diesel knock.
And the diesel knock was usually just down to the pump timing which could usually be sorted by just retarding the pump
Hi how usually just ment slackening the bolts that hold the pump in position and turning the pump, but if yours doesn’t have any movement there then it could be injectors over fueling or the cold start staying open, or the pump timing out a tooth, or the pump itself, I would wait until you get the replacement injectors then see what happens.
There is a Facebook group for the Renault master mk1
It might be an idea to ask there, I do know someone that would possibly know but he is on holiday until next week
 

linkshouse

Full Member
I am struggling to find anything on the internet, and the Renault was a van I always used to stay clear of, but older diesel were a lot simpler to work on than modern diesels.
And in the past I have bought knocking diesel vehicles cheap from the auctions as many were put off by them as they couldn’t tell the difference between an engine knock and a diesel knock.
And the diesel knock was usually just down to the pump timing which could usually be sorted by just retarding the pump
Hi how usually just ment slackening the bolts that hold the pump in position and turning the pump, but if yours doesn’t have any movement there then it could be injectors over fueling or the cold start staying open, or the pump timing out a tooth, or the pump itself, I would wait until you get the replacement injectors then see what happens.
There is a Facebook group for the Renault master mk1
It might be an idea to ask there, I do know someone that would possibly know but he is on holiday until next week
Thanks.

That was pretty much my thinking too. The replacement injectors are on order so I might as well give them a whirl.

The two garages I spoke to after the cam belt failed were reluctant to take the job on as it would require using second-hand parts to repair which they were unwilling to do or stand by (guarantee).

I feel as though it is running now and so close it just needs someone with the knowledge and experience to take it that last step. I've worked on many petrol engines in the past but this is my first diesel.

I just wish I could find an "old fashioned diesel mechanic" that does vintage rebuilds, rather than the more common "replace with new bits mechanics" that seems to be the norm these days. Of course, this is made more difficult by our location.

Fairly predictably the garages I've spoken to so far are reluctant to take on a job started as a d.i.y. project.

I've spent far too much time and money on the habitation side of this van to walk away now, plus there is an emotional attachment (only campervan/motorhome owner would get that I'm sure).

It just feels so close....
 

helen262

Full Member
It is just a pity you are so far away as the garage that looks after our ambulances would fix this for you as he is a mechanic and not a modern fitter, that just throw things away and fit new,
There is no need to give up on it as you are almost there with it, it might be worth talking to someone who specialise in pump and injector reconditioning and getting their advice
 

linkshouse

Full Member
It is just a pity you are so far away as the garage that looks after our ambulances would fix this for you as he is a mechanic and not a modern fitter, that just throw things away and fit new,
There is no need to give up on it as you are almost there with it, it might be worth talking to someone who specialise in pump and injector reconditioning and getting their advice
Yes indeed.

Ha ha, I just looked at your profile to see where you are. I’m originally from Scholes, Cleckheaton.
 

RV2MAX

Full Member
Just listening to the video clip , it sounds more like a tappet than diesel knock , a single stage injection diesel should sound a bit "sharp" if it didn't it was time to worry . Having said all that excess fueling (start) mode could be a possible ,
with some they advance up in start mode . Try the pump retarding route first . This might be of use
https://www.ebay.co.uk/itm/Renault-Trafic-Van-For-Breaking/273835565248?hash=item3fc1df20c0:g:KRQAAOSwKbNc0INa might be source for a few engine parts as spare ? or swapping .
 

linkshouse

Full Member
Just listening to the video clip , it sounds more like a tappet than diesel knock , a single stage injection diesel should sound a bit "sharp" if it didn't it was time to worry . Having said all that excess fueling (start) mode could be a possible ,
with some they advance up in start mode . Try the pump retarding route first . This might be of use
https://www.ebay.co.uk/itm/Renault-Trafic-Van-For-Breaking/273835565248?hash=item3fc1df20c0:g:KRQAAOSwKbNc0INa might be source for a few engine parts as spare ? or swapping .
I've saved/watched the ebay links so I may end up going back to that.

With no experience of diesels, tappet knock was what I thought it sounded like too.

The replacement cylinder head came complete so I expected the clearances to be correct, but when I heard the knocking I did check them all and they seemed okay.

That said, given that I have checked and re-checked everything else about a million times it wouldn't hurt to re-visit these.

Unfortunately, I have to work on this outside and the weather here in Westray is not doing me any favours either!
 

linkshouse

Full Member
Just a quick aside to thank everyone that has taken part in this thread for their patience and advice. It is greatly appreciated.

Phill
 

eddyt

Full Member
Just a quick aside to thank everyone that has taken part in this thread for their patience and advice. It is greatly appreciated.

Phill
hi. i had a knock like that on a GM 2.3 it was a indirect injection engine and it was the combustion chamber was loose
in the head. i dont know if the renault is indirect or direct injection. but the cam followers can be worn or sticking.
or a valve can stick. i had also a small end knocking on a GM 1.7 as well.
 

linkshouse

Full Member
hi. i had a knock like that on a GM 2.3 it was a indirect injection engine and it was the combustion chamber was loose
in the head. i dont know if the renault is indirect or direct injection. but the cam followers can be worn or sticking.
or a valve can stick. i had also a small end knocking on a GM 1.7 as well.
I think It's direct injection.

None of those sound too nice!
 

Growlie69

Full Member
I sympathise with your situation. Hope it turns out well for you and your pocket. We had a gearbox issue with Fiat Ducats fifth gear and our Hymer was off the road for nearly two years, with a reputable garage and waiting for gearbox parts from Italy??
Good luck and hope to see you back soon. Growlie
 
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