Loud injectors

[jb86]

Got my car running a couple months ago
New 1v engine
Giles ip, mild performance upgrade
Everything new and oem parts - injectors, glows, ect
I timed the ip as he told me 0.037-0.038"
My first time installing an ip
But I read everything i could on it
I measured it atleast 6 separate times start to finish
I'm right on 0.037"
I made sure to rotate the engine CW 2 full revolutions before checking - he told me to rotate CW to be sure belt wasn't slack
Cold start handle in
I pulled the cold start out when running cold
I run about 6 ounces of 2 stroke oil in the fuel tank
I've read on the diesel truck forums a lot about that
Walmart 2 stroke is the preferred one

The injectors just seem loud
I dont care
As long as its safe to run and economical
any ideas?
Jon

[theman53]

The new pump maybe lightyears ahead of what you had and putting more fuel in less time than what you are used to. At the same time the old pump and old injectors may have worked well together, but if the injectors sat for a while and the new pump was added they maybe suspect. These cars are noisey IMO when cold as well. If you can I would have the injectors rebuilt to go with your pump, or at least have them tested. You could see if it is just one or two by running it and carefully as not to get diesel shot through your skin, loosening an injection line one at a time to see if your noise changes. if it does then that one is probably a problem and needs rebuilt.

[steevz]

He said the injectors are new. Maybe you could get them pop tested and make sure they're set to the right pressure for your application.

[theman53]

I reread that post and must have missed it both times. As I was looking for it as to see if that could be a problem.

Post a video if you can it is probably just normal diesel noise, hopefully.

[R.O.R-2.0]

He said the injectors are new. Maybe you could get them pop tested and make sure they're set to the right pressure for your application.

advanced timing can make injectors LOUD..

as well as just being new can make them louder than normal.. they need to BREAK IN a bit, just like any other engine parts.. they need to settle into there groove..

[ORCoaster]

R.O.R.  How do man?  How long or how many miles would you say it takes to quiet down a new or rebuilt set of injectors.  I did mine about 6 mths ago, or roughly 7,000 miles ago and I still have a couple that clack worse than the others.  More at idle than at speed, but I can tell there is a difference.

[jb86]

Thanks for replies
The old engine (MF mechanical head) did seem loud, but I never measured the ip
Right now I don't have anything to compare to
When I can I'll make a video of it
The injectors were rebuilt Bosch, correct for turbo engine
I'm adding a few ounces of 2 stroke for lube but may not quiet it
Jon

[Mark(The Miser)UK]

Thanks for replies
The old engine (MF mechanical head) did seem loud, but I never measured the ip
Right now I don't have anything to compare to
When I can I'll make a video of it
The injectors were rebuilt Bosch, correct for turbo engine
I'm adding a few ounces of 2 stroke for lube but may not quiet it
Jon

If everything is rebuilt why do you need oil added? New injectors done per shop should be set a little high; so that they settle down over a few weeks to the target pressure. This will make the pump timing slightly retarded, but the oil will act as a thickener and reduce pumping losses, and advance the pump. 37 thou is a good starting position, but only way to set a pump is to move it whilst idling, to iron out any idiosyncrasies. When sweet spot found, measure with dial gauge, and record somewhere.

[jb86]

On the truck diesel forums (diesel place and cummins) there's been a lot of talk of adding oil
The ulsd fuel has no lubrication quality
The process of removing sulfur also strips the fuel of lubrication
The ip and injectors require some lubrication
I read studies on different additives
They perform what's called a scar test
Rubbing steel pcs back and forth produces wear and they test the additives
The Walmart 2 stroke oil came out as the best solution

So
That's why I ad oil

Should I NOT ad oil
Or for a few thousand miles to allow the injectors to wear in?

As I said from the beginning
The 1v (Eco diesel) is completely rebuilt
Everything is new/rebuilt
Ip mild performance mod by Giles
Injectors are stock turbo injectors rebuilt from parts place inc
I installed timing belt as per Bentley
I had installed a timing belt previously on the old engine
So I was comfortable with that
Giles gave me some specifics on timing the ip
He told me to set at .037-.038"
That translates to about .95mm
I bought a emiata.com dial indicator that came with an adapter
$30 or so
I installed the timing belt
Set the ip timing as instructed
(took practice to learn how, but really is easy)
Injectors sound loud
Definitely louder than they should
Found some time a couple weeks later
Verified timing belt - still perfect
Measured ip again
I checked it about 5 times start to finish
Each time I would remove the dial indicator, rotate the crank several revolutions and ending at TDC, and not ccw to go back to TDC
Every time it measured .037-.038" right on
I then aligned my digital caliper to the dial indicator (best I could by eye) to verify 0-.038"
Looks dead on

Any of the following to consider?
1. Oil in fuel, a mistake?
2. Injectors will wear in?
3. Even though timing is measured in spec, adjust ip to quiet. Retard timing? Rotate head slightly away from cylinder head
I would loosen the 2 nuts behind the ip sprocket, then with engine idling, lightly loosen the 2 other bolts to allow slight turn of ip
Then as said take a measurement for future reference

According to Bentley the timing (of the stock ip) can be .95-1.05mm which is well over .040"
Giles was clear .037-.038. Which would not be greatly advanced
The injectors really are loud
One thing I thought of today- the cold start cable was new oem
At installation - pushed handle all the way in, pushed lever all the way forward. But when I tightened it, it bends the cable. Is it possible that the lever creeps when the cables bends?
If so, it could be acting like the handle is slightly pulled

The timing belt I did per Bentley
With a firm twist it will turn 45 degrees
I swear I can hear the belt slapping the timing belt cover
Tomorrow Im going to run with the cover off the verify it's not bouncing around
Is that possible?

Again thanks for any help
Jon

[damac]

All I can say is if you don't have things to compare to, you might just be noticing a difference.  I am relatively new to these old diesels as well with my jetta and an old f250.  I ended up getting new pop tested injectors for each after initially bringing them home and I would say that the sound, feel and smoke patterns were drastically different.

Both vehicles ran great but the new injectors allowed things to smoothen out, sound more even.  Less smoke when dealing with factory type timing numbers.

On both of these vehicles the advance helps when warming up cold as far as engine smoothness but both are a bit noisier.  And they tend to settle down and sound normal once warmed up.

Start your car up cold and don't pull the cold start lever.  Do you see stumbling, white smoke and less injector cackle?  If you pull the lever at that point does the cackle get louder?

If you went too far it might sound like hammers and you would know something is off terribly and you wouldn't want to run it if the hood was up.

How about when trying to start the car cold with the cold start lever pulled out.  Does the engine noticeably turn over slower?

That might be a hint its a tad too advanced.  With mine set right now at the sweet spot that doesn't happen, but a nudge advance and I can just tell the engine is fighting it when turning over.