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#1
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Injector shim sizing
Does anyone know of a chart or list where the size of the shim and the amount(roughly) of psi change it will cause might be found?
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#2
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Used Injector springs will exhibit a variation in spring tension to the point that you cannot count on a x sized shim to change the Pop/Opening Pressure the same on all of the Injectors.
You test an Injector; write down that Pop/Opening Pressure. You use the FSM recommendation to guess the size shim you might need. You put that Shim in and you test again. If the Pop/Opening Pressure is not correct you take the difference between the original Pop Pressure and the Pop Pressure with the new shim and see how much shim thickness it took to cause a change in Pop Pressure. Now you have a little formula for your individual Injector and go off with your Micrometer or Vernier Caliper to find the next thickness of shim based on your formula. And, you do that with each Injector. It is easier to do than to write about. Added: This is from the Factor Service Manual concerning changing the Spacer (Shim): "Increasing the preload by 0.05mm increases the Injection Pressure by about 3.0 bar positive"
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84 300D, 82 Volvo 244Gl Diesel Last edited by Diesel911; 09-23-2009 at 04:00 PM. |
#3
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Quote:
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#4
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If you intend to balance your injectors well you really need an assortment of shims to pick from.
Even, with an assortment of shims there often is one Injector that can not be balanced as close as the others.
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84 300D, 82 Volvo 244Gl Diesel |
#5
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When installing new injectors, is balancing a necessary step?
Any idea how much it should cost, at a shop? thanks, Bri
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'85 300DT 170K '99 R1100RS 63K '84 300DT 126K ate her own camshaft '83 300DT 252K executed by non-driver '68 F-100 138K sold (why?) |
#6
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"Bosch OEM... I'll put it this way... this week I had a client without funds to purchase genuine MB injectors, so they opted for Bosch OEMs at lesser cost to them. The initial order of five injectors yielded two that were within specification. One of them exhibited no chatter and simply streamed its fuel. This is unacceptable, but is and has been the norm for a number of years. I would not install any Bosch OEM injector without testing it first. They can not be trusted without testing, in my opinion. These are typically rebuilt in third world countries, hence the decreased cost and poor quality control. Local rebuilder? If you have a local outfit that is skilled with these injectors and is using a quality nozzle, there should be no problem withe them. However, you want to know the pop pressures and to witness the spray patterns first hand. I would not trust someone's word on the matter. Fact is, it takes some time to dial in an injector for optimal performance. It is quite easy to throw one together and to get mediocre performance." est injectors for a 617.952 engine Back to me. I believe Rebuilt Injectors that are grabbed randomly from a parts bin will most likely not be balanced. Due to the allowable range of pressure of 1958-2074 psi that they can be rebuilt to. As that guy said in post #5 of that other thread a local shop will try to balance them much closere that the max allowable 5 bar (72.5 psi).
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84 300D, 82 Volvo 244Gl Diesel |
#7
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There is not as many Fuel Injection shops as there used to be so there will not be many listed in the Phone book.
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84 300D, 82 Volvo 244Gl Diesel |
#8
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thanks,
I was just gonna ask if you knew a shop around here. I think it'll take months if I do it myself. I'll see what I can find.
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'85 300DT 170K '99 R1100RS 63K '84 300DT 126K ate her own camshaft '83 300DT 252K executed by non-driver '68 F-100 138K sold (why?) |
#9
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************** on eBay sells kits that come with many different sized injector shims, and they even make an inexpensive pop tester for the DIY'er!
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#10
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The Shops I knew of back in the day are all gone. The last place Iworked for in 88; Fuel Injection Sales and Service, in El Monte is still around ad they are a big Company. They are a good quality shop; but I do not know their prices as I worked only on Fuel Injection Pumps when I was there and even if I knew that price could have changed since 1988.
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84 300D, 82 Volvo 244Gl Diesel |
#11
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I'm thinking about getting the pop tester and nozzle kit
from mercedes source. $300 for the tester, monarch nozzles w/heat shields, 30 pc shim kit, manual and gloves. wondering if anyone on here has experience with their tester. seems like an alright deal, since I plan to do the nozzles on the other car soon as well. unless someone else on here is doing rebuilds? also wondering, what would be cause to replace entire injector, as opposed to just changing nozzle? obvious mechanical failure? pitting, or...? I don't know what happens to them. or just the assumption that they would already be balanced? thanks, Bri
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'85 300DT 170K '99 R1100RS 63K '84 300DT 126K ate her own camshaft '83 300DT 252K executed by non-driver '68 F-100 138K sold (why?) |
#12
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I remember a while back, there were a few members on here that were doing injector rebuilding/balancing for a fee...is anyone still doing that?
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#13
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BGKAST was doing them, to a search on his name and PM him, he`s a real
nice guy and takes pride in his work. Do a search on pop testers, there have been a few different one`s made from a bottle jack or other type small jack. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#14
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Leaking Fuel Return Nipples, Broken Springs, Cracked Injector Nut. Less ofter there is a plate inside of the Injector that can some times have problems. But, most of the above can be solved with anothe Injector from the J Yard. The main problem is the Expense of the Pop/Nozzle Tester. There is at least 2 Members that have bought the M Source modified Hydraulic Jack Pop Tester. It would be nice if they would comment on it.
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84 300D, 82 Volvo 244Gl Diesel |
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