As I keep telling you :

You need to rattle my cage as I always have more on my plate than I can do as jobs run shy of parts, problems crop up etc. and I forget .

Last Spring just sold ! All gone. Thanks Everyone !

Please PM me when you have another complete unit to purchase.

Exchange OFV
 

Shouldn't be too long a wait .

Remember : you have to send your old one back ! .

Will have five (5) units for sale, that's a cleaned OFV with the mod'd spring installed, ready for install. The Buyer will have to either re-use their aluminum sealing washers or get new copper ones. The original aluminum sealing washers should work just fine unless they have been really distorted (which means someone in the past has tinkered with the OFV).

$40.00 shipped CONUS. I have given up on folks returning their OFVs for the $5.00 refund so no need to send anything back / no core deposit / no core deposit being provided.

Taking orders now (paid) HOWEVER -- these will not be shipped for approximately two (2) weeks. First pay, first get. I do not "reserve" or hold nozzles, OFVs, or other parts any longer.

Apparently, two (2) are spoken for.

Down to three (3).

As noted above, there will be a delay in shipping these. If you pay now, you are guaranteed one.

Thanks again !

Thanks Again .... all spoken for !

I'm not very damn happy with this forum right now; didn't ever get notification of any other post in this thread, until today!

If you build more, could you PLEASE PM me as I asked? Thanks.

I will try to remember ... not intentional ...

Pardon me for asking, but why would one want to increase the pressure when Mercedes gives a specific value range of pressures that the pump should see? It would seem that the risk of damage to the fuel system would be very real if you increased pressures beyond the factory specified 1.0-1.3 bar.

The manual says that if the pressure drops below 0.8 bar to simply remove the spring, stretch it to 27mm and then check the pressure. If it's not within the specified range the hollow bolt assembly should be replaced with a new one and/or the lift pump should be replaced or rebuilt.

After all, the new part from Mercedes (000 074 72 84) is only $27.00 list from any dealer, probably less from some.

Just wondering....seems like a rather dangerous thing to be doing, not to mention a possible waste of money...

People run 45 psi (3 bar) no problems. I stretched the spring so tight the return line has only the injector return fuel going through it. And that's after I "de-stretched" it :P Sorry to Greazzer for going beyond his springs intentions ;)

In addition to the "performance" aspect, there's also a service/functional aspect to using one of Greazzer's overflow valves. On the later vehicles (60x engines) the overflow valve has a fairly weak spring and a plastic element inside of it. When (not if) the plastic element warps or breaks, the fuel pressure in the fuel rack drops at low RPMs and the "check valve" function of the overflow valve is lost. The result is (or can be) rough idle, poor low-RPM power, or rough starts from cold when sat.

I had the latter issue with my SDL. A new overflow valve from the dealer with tax (or ordered online with postage) is roughly what Greazzer is charging for the older style valve that gives a positive seal and can be serviced in the future when it gums up or gets spring fatigue. Since I can't seem to find one of the valves to save my life, the choice to pay the dealer or Greazzer was a no-brainer. My car is much happier in the mornings, no more craptastic cold starts.

Mercedes did not design the fuel system. Nor did they produce it to the best of my knowledge. The designers of the system had concerns that perhaps have not proved to be justified. The minumin operational pressure has validity.


They did expect certain levels of maintenance that in general was never performed often if at all. They perhaps where also the first to produce a diesel fuel system with no water and sediment trap. At a time when this was far more important.


Increasing the base fuel pressure does result in better filling of the injection pumps elements. Producing more power if the rest of the fuel system is in good condition.


Mercedes does recommend periodically checking it with a gauge but again is seldom done. This very old fuel design system is both really durable and reliable if a general maintenance check is done every few years. Otherwise the chances of being stranded along the road somewhere are increased. Most maintance is also cheap to do.

"WHY"
 

In addition to the other replies ;

Because I personally have opened quite a few of these and _every_single_one_ has had a worn out spring ~ not only do coil springs have a finite life span but the check ball sits directly in the end of the spring and moves constantly, this wears the open end of the spring until it fails ~ many I have seen were paper thin and crumbled when I touched them .

As mentioned, older German cars/mechanics/engineers all assumed you'd be endlessly under the hood cleaning, adjusting and testing things .

A Mechanic I know was trained in Germany, by Mercedes but thinks they're '****' because of this aspect ~ he drives a Lexus and will trade it in long before it reaches 80,000 miles so he sees no point in doing the things we Diesel Heads consider normal .

As an update: I am currently all sold out and none have been ordered. To the various folks who have PM'd me or emailed me, I will post here when I get some. Generally, I do not reserve parts, nozzles, et cet., and that would include OFV springs. Unfortunately I take this stance because too many forum members have screwed me around in the past by emailing me or PM-ing with this or that request for nozzles, parts, et cet. I would go get nozzles, parts, et cet., and then I would never ever hear back from the forum member, not even "I sold that car" ... "that car got in a wreck" ... so I got stuck holding stock until I could sell it.

I am anticipating getting maybe an order of around 50 so that would be plenty for folks who want one.

Thanks in advance.