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  #1  
Old 11-29-2009, 12:53 AM
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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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  #2  
Old 11-29-2009, 03:46 AM
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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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  #3  
Old 11-29-2009, 12:39 PM
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Quote:
Originally Posted by i-osprey View Post
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.
If C Sean Watts tested your Injectors balance would be one of the things he would be testing for.
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  #4  
Old 11-29-2009, 12:57 PM
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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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Old 11-29-2009, 01:13 PM
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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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Old 11-29-2009, 01:17 PM
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Quote:
Originally Posted by lupin..the..3rd View Post
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.
Actually, most Bosch affiliated shops will not install new parts you bring to them unless they are Bosch brand.
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Old 11-29-2009, 02:17 PM
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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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  #8  
Old 11-29-2009, 03:31 PM
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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.
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  #9  
Old 11-29-2009, 03:33 PM
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How much for these monarch nozzles from c sean watts? Are they 100% brand new?
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  #10  
Old 11-29-2009, 03:56 PM
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There are some "ifs"

Quote:
Originally Posted by macdoe View Post
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.
IF the part numbers are all the same they can be used as a set. The difference in most late 1970s to mid 1980s Mercedes is pop pressure for normally aspirated or turbo.

Be careful not to touch the metal with bare hands, unwrap them and read the numbers....?

PM sent for price.
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  #11  
Old 11-29-2009, 05:22 PM
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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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  #12  
Old 11-29-2009, 05:38 PM
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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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Old 11-29-2009, 06:36 PM
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Originally Posted by toomany MBZ View Post
I believe the pressures are dictated by the shims and the spray pattern by the nozzles. Two different items.
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)
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Old 11-30-2009, 02:43 AM
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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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Old 11-30-2009, 10:38 AM
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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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