Why do I have two timing marks?
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Senior User
Joined: Mar 2006
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From: San Carlos, CA
Why do I have two timing marks?
I noticed something interesting regarding the position of the timing marks on the IP. On the old pump that I just removed, the timing mark was staked in at about the 2 o'clock position looking from the front of the engine. There were marks on both the IP and cover. On the new IP the mark is at the 12 o'clock position and there is also a mark on the cover for that which is what I am currently lined up with. Does anyone know why I might have 2 marks? Wondering if I had a replacement pump done by a previous owner and made their own marks once the engine was timed or was this something the factory did.
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Senior User
Joined: Mar 2006
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From: San Carlos, CA
Thanks Malcolm. Is it common when someone resets the timing to stake a new mark? I forgot to look at the old pump to see if it had another mark before sending it in for core (if it was the original).
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Mine has those same two marks - one at twelve o'clock, one at two. The one at twelve looks like a factory mark - perpendicular to the mounting flange and clean cut. The other one looks like someone took a 1/2" cold chisel and hit it across the two flanges at a bit of an angle.
I really don't get it because IIRC the two marks don't represent different timing positions on my engine, they both line up at the same position; seems kinda pointless - maybe someone else knows
Oh, and I think my IP was the original - I just changed it last month (320,000kms). The rebuild had the same marks. The technician at the injection shop told me to ignore those marks and install the pump as level as I could. Level just happened to be where the marks were, and the timing was set very close too. So I dunno...
Guy
I really don't get it because IIRC the two marks don't represent different timing positions on my engine, they both line up at the same position; seems kinda pointless - maybe someone else knows
Oh, and I think my IP was the original - I just changed it last month (320,000kms). The rebuild had the same marks. The technician at the injection shop told me to ignore those marks and install the pump as level as I could. Level just happened to be where the marks were, and the timing was set very close too. So I dunno...
Guy
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Senior User
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From: San Carlos, CA
I didn't get it either. thought my pump was original as well since it had grey paint on parts of it. A mechanic I am thinking about taking it to time thought it was a replacement but he didn't look that carefully. My rebuilt pump had 2 marks painted over and a new mark staked in all at the 12 o'clock posiiton.
Sorry for the stupid question but what does IIRC stand for?
Sorry for the stupid question but what does IIRC stand for?
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Joined: Oct 2003
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From: Monroe, WA
Ha, thanks for that. I was wondering on IIRC too. 
Yeah, it's pretty common for shops to stake a new mark. If you changed the pump and remarked it on top, you'd have two marks on the engine and one on the pump (unless they were really good with a chisel). You would always wonder if the pump was on the right one.
Yeah, it's pretty common for shops to stake a new mark. If you changed the pump and remarked it on top, you'd have two marks on the engine and one on the pump (unless they were really good with a chisel). You would always wonder if the pump was on the right one.
Last edited by Spectramac; Nov 7, 2006 at 08:52 PM.
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Posting Guru
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From: Douglas, Georgia
i dunno if it is relevant to the DB2
but all the old roosamaster pumps I've replaced/timed on farm machinery have the same mark.
on inline motors these pumps are mounted to the side, and often timed from the side (as topside view isn't always possible or terribly comfortable).
but all the old roosamaster pumps I've replaced/timed on farm machinery have the same mark.
on inline motors these pumps are mounted to the side, and often timed from the side (as topside view isn't always possible or terribly comfortable).
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From: Manitoba
The original pumps had 2 timing marks on them. One at 12 o'clock and another at about 2 o'clock. The 12 o'clock was to get the engine running. The one at 2 o'clock was put there after engine was "power timed" at the factory. If the pump has been changed or overhauled, use the 12 o'clock mark to get it started, but have it properly timed.
7.3.......8-9 degress BTDC optimum at 2000 rpms.
7.3.......8-9 degress BTDC optimum at 2000 rpms.
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Senior User
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From: San Carlos, CA
Thanks PLC. Would it be correct in saying then that the pump was probably original? Still looking for a shop in my area that can do the timing. I did find one shop who had the right equipment but he hasn't done one in many years and said he only used it twice before. Might make him an offer to take it off his hands.
