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#1
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Really newbie question about pump elements
Hi all,
I am about to ask a really newbie question and I apologise in advance, its concerning elements in the IP. I know that my stock OM606.962 engine has 6mm elements. Here are my queries: Am I correct to say that the elements are the parts sticking up on the top of the pump which connect to the individual fuel lines to the injectors? Am I correct to say that the diameter of the hole the fuel flows through on my pump is 6mm? Am I correct to say that there is a plunger inside the element which then gets pushed up by the pump internals which then sends the fueling through the lines? Upgrading the elements from a 6mm to an 8mm element would mean that the element would have a 8mm diameter as well as matched with an 8mm plunger - or is it just the diameter at the top of the element that gets enlarged and you can run stock plungers? I only ask as I know someone who is a machinist who has various lathes etc - I was wondering if it were possible to simply get a set of stock elements and modify them by enlarging any ports and then machining slightly larger plungers if needed? Sorry for the newbie questions, I know that some people have done a DIY swap of the elements but all I can see is that the element is held at the top of the pump which might mean that if they are kept in the same order they might not need calibrating?
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free! |
#2
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The parts sticking up are the delivery valves. They are a 32 spline fitting and they screw into the injection pump body. Below these are the elements.
I wouldn't think a local machinest could ever make pump elements. They are extremely EXTREMELY precise pieces of work. They control the fueling behavior of the pump. If you want to upgrade the pump: Remove it from the engine Send it to Goran at Dieselmeken He'll install bigger elements and recalibrate the settings Reinstall the pump Add more air with a bigger turbo to burn the extra fuel. Done, after a few thousand dollars.
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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it! '85 190D 2.2 Auto *Cali* (Blue/Blue) *sold* http://badges.fuelly.com/images/sig-us/302601.png http://i959.photobucket.com/albums/a...0/sideview.png |
#3
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How do the elements work then? I know that there is a camshaft below which gets turned by the engine at half speed, this then pushes up on the rollers and plungers - guessing the elements are between the plunger and the delivery valves on top?
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free! |
#4
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Exactly! The cam pushes on the elements and the fuel is sent to the injector. The element has a slot cut into it. The rack rotates the elements within the bore of the element. This rotation clocks the plunger's groove so that the element fills with a lot of fuel, or not much at all. The groove is where the fuel fills the element. I'll see if I can find a video I remember watching that animates this.
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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it! '85 190D 2.2 Auto *Cali* (Blue/Blue) *sold* http://badges.fuelly.com/images/sig-us/302601.png http://i959.photobucket.com/albums/a...0/sideview.png |
#5
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Diesel injection pump elements are super precision ground parts. Machining is not accurate enough, they must be precision ground and are of super tight tolerance to the plunger barrels which are ground to the same quality and are made of very hard steel.
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87' 300D, Currently undergoing an OM606 swap/build! SUPERTURBO!!! 03' 2500HD Dmax + goodies! 82' 300SD, parting out! 93' 300TE 4matic, parting out! 83' 240D Project Cheap Drive 89' 300E, parting out! 74' Datsun 510 wagon 88' RX7 10thAE, 13B track car build soon Skippy~ As for perception: Drive what you like and can afford. Those who don't like it can supply vacuum to one of your components. LOL If you need parts, I have some! |
#6
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Quote:
I can see why these would need to be strong as they must be acting like valves within the delivery valves?
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free! |
#7
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some guys even tried with DV machining but afterwards had some idle issues.... .
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded next wish/project: w114 coupe OM603 powered |
#8
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The number you see relating to elements is effectively the bore size. You can estimate element output by doing a simple area calculation. 6mm elements have 28.27 mm3 of area 7.5mm elements have 44.17 mm3 for a potential increase of about 150%.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#9
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free! |
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