New Monark Injectors were sent to local diesel shop for mating to the injector bodies using precise calibration (no shims) and set the spray pattern. I installed the new Monarks using new heat shields.

Recently, there has been some nailing on start up. Once the engine is warmed up, the nailing stops, the engine quiets down and sounds normal. I'm thinking of purchasing injector line heaters/fuel filter heaters in hopes of quieting things down. Any ideas as to why the cold start up noise/nailing?

how long have the nozzels been in? I think it takes like 1000miles or so to seat them properly.
what do you mean "precision" "no shims" I've not heard of this. contact C.SeanWatts here on the forum for info on the monarks and installation info.
but it could be normal seat in on them!

Was the pop pressure increased? My new nozzles were jumped to 145 and this retartded the injection enough to really make a racket at cold idle.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Good question, I"ll check with the outfit that did it and report back.

Mr Watts did my Monark nozzles, and it took around 800 miles before they quieted down.

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1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide

X2 for Sean Watts. I had alot of air in the system that componded the noise.
I kept cracking the injector nuts and was getting beer like bubbles, very small, but still there. When I finally got all the air out it was better. Mine got really quiet after about 300 miles.

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1987 300D 146K Original #14 Head
One eye on the road, the other on the temp. gauge

Gone But Not Forgotten
1983 380 SEL Long gone
1983 300SD Wish I hadn't traded it in on a 90' Corvette
1989 300SE My all time favorite
1995 E420 Went like a bullet

You may need to check the pressure control on the IP, If its not getting enough feed pressure when cold the injectors will play up like that. There are several threads about the dreaded spring in the banjo bolt on the return.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving