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+--- Thread: pulse timer? (/showthread.php?tid=3968)
pulse timer? - DirtDiesel - 10-04-2012
went to the shop today and talked a bit about how the ip is timed and one of the mechanics brought up some kind of timing device like the ones used on gasoline motors with the light but instead they sense the pulse from the fuel in the injection lines? just wondering what this tool is all about and if it will even help me out.
RE: pulse timer? - Mark_M - 10-04-2012
As you say it counts the pulse of the fuel and then flashes the strobe. It won't help you set the initial timing but it should help you dial it in if you can get the advance curve information. I know Snapon does one but so will others for a lot less although none of them will be very cheap.
RE: pulse timer? - DirtDiesel - 10-04-2012
would it replace the drip method. would you expand on this as i am new to the mb
RE: pulse timer? - Mark_M - 10-05-2012
No it wouldn't replace the drip test as that is for the initial static setup of the pump. Think petrol engine with a distributor where you wouldnt/couldnt use a strobe to set the initial distributor position. All your doing with this strobe is replacing an electric pulse of the ignition with a mechanical pressure pulse. What it would mean is that after the initial positioning of the pump (not sure how close it would have to be to run good enough) you could use a strobe to set the timing bang on to what you wanted. Like I said earlier though you would need the figures for the advance curve. For pertrol engines the timing figure will be something like 14deg at idle and maybe 20deg at 3000rpm where static might only be 10deg. These are figures I am pulling out the air but it shows what an advance curve is. I have only ever seen the static figure for a diesel engine, what you would need is the idle figure.
RE: pulse timer? - Secondaries - 10-07-2012
Just use the timing lock pin tool. It's technically for locking the IP timing for removal and installation. But can be used to set the timing, probably more accurately than the drip method. Less messy too and only around 30 bucks.
RE: pulse timer? - DirtDiesel - 10-08-2012
do you have a parts number possibly a picture for this tool. will it work on my 82 300d
RE: pulse timer? - Secondaries - 10-09-2012
http://www.ebay.com/itm/120943412467?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
This is the tool I purchased for the job. There are two different tools depending on the year of manufacture, this one being for IPs manufactured 82 and on. Only the very earliest W123 MW-pumps were incapable of using these tool, if I remember correctly. Click this link to see what the tools look like for the different years, along with part numbers. Being a 1982, it could be either or so pay careful attention to how the port looks on your pump. Click this link to locate the port that this tool requires.
Good luck and let me know if you need any more help with this tool!
RE: pulse timer? - DirtDiesel - 10-09-2012
well according to the link it looks like mine requires the earlier one but im not 100 percent maybe pull that plug out and see what it looks like. the pictures posted looks like the earlier ones had a smaller diamer of threads