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  #1  
Old 05-24-2011, 07:59 PM
cirrusman's Avatar
Just add Diesel.
 
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Location: Salt Lake City, Utah
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Question Hard knocking after installing new Monarks

So I just purchased a set of new monarks. Took the injectors out and took them to this diesel place where they put them in. Just installed then a couple minutes ago and now I'm hearing this "pfft-pfft-pfft" out of one of the injectors and a loud knock... I torqued the injectors @ 50 pounds and all lines are tight and there are no leaks anywhere. What could've gone wrong here...?
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1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"





1988 Toyota Pickup (The little cargo hauler)
1965 Ford F100 (The big cargo hauler)
2004 Subaru Outback (Wife's ride)


Gone:
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT - Wrapped it around a light pole, racing days are over...
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  #2  
Old 05-24-2011, 08:48 PM
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1987 w124 300D
 
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You took out the old and put in new injector seals down the holes, right?
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  #3  
Old 05-24-2011, 11:05 PM
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Location: West Quebec
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When this happened to me it was one of the hard line connections. Even with care it's not that hard to misalign the ends and then the nut won't tighten properly.
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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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  #4  
Old 05-25-2011, 10:07 AM
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Thanks guys; yeah, I got new heat shields with the new nozzles that went down the holes just perfectly.
I was worried about the lines as they did not aling perfectly at first, but they are tight and secure, no diesel leaks anywhere; the sound seems to come more from injector #4 (from front to back). The injectors were cleaned professionally and look like new, no leaks there either. I do not know, however, at what specs were the injectors adjusted. For all I know they could have used the very same shims to adjust the pressure. Would using the same shims cause the sound and the knocking?
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~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"





1988 Toyota Pickup (The little cargo hauler)
1965 Ford F100 (The big cargo hauler)
2004 Subaru Outback (Wife's ride)


Gone:
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT - Wrapped it around a light pole, racing days are over...
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  #5  
Old 05-25-2011, 10:52 AM
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Sounds like you don't have a good seal. Mabe washer put in wrong? Maybe dirt not cleaned off? You need to take the injector out, clean mating surfaces and install with a new washer.
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  #6  
Old 05-25-2011, 11:40 AM
cirrusman's Avatar
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Well, the washer was new and put in in the right position, the injector was thoroughly cleaned. I think they even polished it, it looks like new. The hole where the injector goes did have some oil, but I wiped it off as much as I possibly could in such a limited space... So no matter what the pressure is, the injector should mot make any noise? how can you tell that the pressure is off?
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~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"





1988 Toyota Pickup (The little cargo hauler)
1965 Ford F100 (The big cargo hauler)
2004 Subaru Outback (Wife's ride)


Gone:
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT - Wrapped it around a light pole, racing days are over...
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  #7  
Old 05-25-2011, 12:35 PM
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New injectors can be a bit noisy. It takes them a 100 miles or so to settle into their normal working. My 240 was extra noisy after I put in the injectors, but soon what quite and smooth as a baby's bum.
But I'd call the shop and verify what they set the pop pressure and they set the pop pressure.
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  #8  
Old 05-25-2011, 04:52 PM
cirrusman's Avatar
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Oh, really? Didn't know that... thanks! I will check with the shop that pressure.
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~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"





1988 Toyota Pickup (The little cargo hauler)
1965 Ford F100 (The big cargo hauler)
2004 Subaru Outback (Wife's ride)


Gone:
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT - Wrapped it around a light pole, racing days are over...
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  #9  
Old 05-25-2011, 05:52 PM
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Nicht verantwortlich
 
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Just to clarify. Did they install new nozzles on the old body? Or are these entirely new injectors? My brand new injectors (supplied by member Sean Watts, hell of a good guy) took about 150 miles to break in and stop knocking. I too was horrified when I fired mine up. It sounded like someone dropped a bunch of diamond hard ball bearings into the crankcase. Drop some lubricity additive into your diesel tank (Lucas comes to mind) and see if that helps.
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  #10  
Old 05-26-2011, 07:38 PM
cirrusman's Avatar
Just add Diesel.
 
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Quote:
Originally Posted by JiveTurkey View Post
Just to clarify. Did they install new nozzles on the old body? Or are these entirely new injectors? My brand new injectors (supplied by member Sean Watts, hell of a good guy) took about 150 miles to break in and stop knocking. I too was horrified when I fired mine up. It sounded like someone dropped a bunch of diamond hard ball bearings into the crankcase. Drop some lubricity additive into your diesel tank (Lucas comes to mind) and see if that helps.
They just put in new nozzles in my old injectors, but they cleaned them up and they actually look like new. Really nice job. It seems to have settled now and I can't believe how quiet the engine is now! Wow! Difference of night and day. It sounds like when I run the engine on diesel purge; one can hardly hear the clac-clac-clac anymore. Or my injectors were just really lousy and I had gotten used to that sound, I don't know. Now my injector #5 is leaking from the body so I'll have to return that one so they can fix it, but otherwise I'm really happy with the change.
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~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"





1988 Toyota Pickup (The little cargo hauler)
1965 Ford F100 (The big cargo hauler)
2004 Subaru Outback (Wife's ride)


Gone:
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT - Wrapped it around a light pole, racing days are over...
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  #11  
Old 05-26-2011, 07:58 PM
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My 240 was a whole new car when I put the new injectors in. The idle is so much smoother now. It won't spill your coffee while sitting at the light
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  #12  
Old 05-27-2011, 01:23 PM
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Quote:
Originally Posted by Biodiesel300TD View Post
New injectors can be a bit noisy. It takes them a 100 miles or so to settle into their normal working. My 240 was extra noisy after I put in the injectors, but soon what quite and smooth as a baby's bum.
But I'd call the shop and verify what they set the pop pressure and they set the pop pressure.
Gus at pacific Fuel Injection did my injectors and set mine 10psi over spec as I remember, he said this is always done for high mileage motors -
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  #13  
Old 05-27-2011, 01:36 PM
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I think you mean 10bar over. Certainly not going to hurt anything, a lot of the VO'ers bump their injectors up 10-15bar. Helps atomize fuel. It will slight retard injection timing though.
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