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#1
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Diesel Injectors, Replace or Rebuild
I'm wondering the condition of my injectors on my 1987 300TD, I dont think anything is wrong With them, however I doubt it any maintenance was done with them. What are your thoughts, Should I just replace them foregoing any problems, Rebuild them (which brings up another question) or just leave well enough alone until I am sure there's something amiss?
My other Question is, If I buy new injectors heat shields etc or rebuild the ones I have, Will I need to have them balanced? I've read that a few times in a few threads and it's a new concept for me.
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hum..... 1987 300TD 311,000M Stolen. Presumed destroyed |
#2
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I bought some new(the whole thing) Monark injectors from C. Sean Watts and they have worked beautifully right out of the box.
He told me that he has tested them before but doesn't any more because they are all in spec from the factory. I didn't balance mine and all is well. I have heard that you shouldn't trust Bosch injectors the same way though.
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1993 W124 300D -297K on the clock as I type this. |
#3
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Quote:
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84 300D, 82 Volvo 244Gl Diesel |
#4
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You can buy new nozzles, and then take those new nozzles along with your injectors to a local diesel injection shop and have them rebuild them. They will disassemble the injector bodies, ultrasonic clean all the parts, install the new nozzles, then pop-test them and shim them up to the correct opening pressure. Cost varies, but it's relatively inexpensive.
IMO this is the way to go, they will be better quality and better balanced than buying new. Plus you can use your own German (monark) or Italian (Bosio) made nozzles without worrying about getting some generic made in India or China stuff.
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'98 E300 turbodiesel |
#5
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A word about balance.
The 100% new ones from Monark have all been set razor sharp from the factory. In fact, less than one needle width of variance on the pressure gauge.
The factory range for servicing old injectors is +or- 3 bar (about 45 psi.) I get them to +or- 2, generally. What seems to contribute to a smoother running engine is not the pop pressure alone but how close the pressures of the whole set are AS A SET, IE: precise balance. I have seen Bosch and Delphi out of the box not in factory range. I've also seen some from various 'professional diesel shops' not even remotely close to where they should be and even some that were filthy inside. *personal opinion* At service time, IF one were planing on selling the car sooner rather than later, fitting new nozzles is a good idea. BUT, if you plan on keeping the car, complete new injectors are best since the springs are new, there is no distortion in the treads whatsoever and they will not leak.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#6
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Quote:
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#7
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I am planning on keeping this car for a long time, who makes the best injector? and how much do they cost?
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hum..... 1987 300TD 311,000M Stolen. Presumed destroyed |
#8
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Hello, The last 300TD car I bought came with a brand new set of nozzles. They came in a box of four and then one single one wrapped in wax paper. These are Bosio nozzles. I am wondering if these are the right ones for a 3.0 litre 5 cyl. diesel....or did the p.o buy nozzles for a 240d 4 cyl. in which case I would think that I cannot use them as I have read somewhere on here that they have different sized holes. Is this true? Do the turbo motors have a different injector size than the n/a motors (both 4&5 cyl.)?
Thanks. |
#9
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How much for these monarch nozzles from c sean watts? Are they 100% brand new?
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#10
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There are some "ifs"
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Be careful not to touch the metal with bare hands, unwrap them and read the numbers....? PM sent for price.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#11
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rebuild with Monarch nozzles, I bought the pop tester but after rebuild all were at correct pressure. I did not need the pop tester
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1976 300D W114 1979 300SD W116 |
#12
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I believe the pressures are dictated by the shims and the spray pattern by the nozzles. Two different items.
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83 SD 84 CD |
#13
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It's not just your belief, it's fact
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#14
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When I start my car for the first time of the day, It sounds like it misses for a very short time then idles normally.. It's like a sputter run sputter sputter sputter run normally... And it only does it the first start of the day. I can let the car sit all day in a parking lot and it wont do it, always in the mornings... Could one of my injectors be leaking and having diesel pool in the cylinder? I plan on replacing them all and the heat shields January or February.. as this month is motor mounts, motor shocks and a valve adjustment
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hum..... 1987 300TD 311,000M Stolen. Presumed destroyed |
#15
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I would think the only way for diesel to pool in the cylinder is a timing problem, but pull and test 'em.
You may have a glow plug issue, have you checked them?
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83 SD 84 CD |
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