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Correct Timing Marks 240 & 300

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old28racer
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Correct Timing Marks 240 & 300

Post #1 by old28racer » Sun Jun 09, 2019 4:37 pm

I have a 300 motor that I am building that has a 240 harmonic balancer & the timing marks on the cam gear cover. As I understand those marks are not the correct ones to use on a 300 motor? The timing plate on the passenger side is the correct setup.

My 1971 F250 has both timing marks but I have no idea where the thin line on the 300 balancer is & where it is located. The timing plate is not like some I have read about on 300 motor with a -0- notch then small notches back to a large notch that is 10 degrees BTDC. My plate has only small notches to 16 degrees BTDC.

Anyone have some pictures of what my 1971 F250 300 should have?

The 240 balancer on my 300 shop motor has a single notch on the back side edge where TDC is at and it matches the long raised arrow on the timing gear cover. I think this is how the original 240 motor timing was set. Am I correct?
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pmuller9
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Re: Correct Timing Marks 240 & 300

Post #2 by pmuller9 » Sun Jun 09, 2019 8:49 pm

Why not just bring the number 1 piston to TDC and see where the mark on the harmonic balancer is.

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old28racer
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Re: Correct Timing Marks 240 & 300

Post #3 by old28racer » Sun Jun 09, 2019 11:42 pm

pmuller9 -- Ya Paul, that is what I will do as I can not find any line on the balancer. My questions were to try to get a bit more 240/300 timing knowledge. Was the raised mark timing gear cover carried over from the 240 motor & a timing tag installed on passenger side of the timing cover for the 300 motor like I have on my 1971 F250 300 4.9L?
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Re: Correct Timing Marks 240 & 300

Post #4 by bubba22349 » Mon Jun 10, 2019 12:27 am

Timing marks on the timing cover are the same for a 240 and the 300's the Dampner mark is the same thin type line. The EFI 300 engines and later carb emissions type engines have timing marks on the passenger side these marks are like a round gun sight and correspond for use with a wider square notch on the Dampner. These passenger side timing marks are Usally used with smog test machine equipment. Good luck :thumbup: :nod:
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I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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old28racer
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Re: Correct Timing Marks 240 & 300

Post #5 by old28racer » Mon Jun 10, 2019 1:59 am

bubba22349 --- Thanks for the additional information, I will be checking my 240 balancer for any lines along with my 300 that is in my F250. It has no smog (CA pre 1975 exempt now) but it may of had smog when built in 1971 and this is why it has a timing plate on the passenger side also. This is the first time I have heard about smog timing junk on a 300 4.9L. :bang:
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Re: Correct Timing Marks 240 & 300

Post #6 by BigBlue94 » Mon Jun 10, 2019 10:07 am

My balancer (the dorman one that fell apart) only had a thick notch on it that was supposed to be the timing mark. Well I dont have the passenger side pointer on my 300 and that's where it was lining up at, at TDC. So i just brought #1 to TDC and made my own mark at the 0° mark on my timing cover. Then I painted the mark orange. Works just fine for me
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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old28racer
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Re: Correct Timing Marks 240 & 300

Post #7 by old28racer » Mon Jun 10, 2019 12:16 pm

BigBlue94 -- Thanks Sam, If I can't find a good mark that is easy to see with a timing gun that is what I will do also. Maybe I will luck in and the TDC mark will line up with the timing plate :thumbup: :nod:
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wallen7
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Re: Correct Timing Marks 240 & 300

Post #8 by wallen7 » Mon Jun 10, 2019 1:54 pm

If you are facing the front of the balancer with the keyway at the top the timing mark should be just to your right about an inch roughly. On older models it will be a notch and later models a thin line if I remember correctly.

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Re: Correct Timing Marks 240 & 300

Post #9 by old28racer » Mon Jun 10, 2019 4:27 pm

wallen7 -- Thank, I hope to get under the motor tomorrow and clean the balancer off real good and see what marks or notches are on it. I think there is a thin line some where as it has the passenger side timing plate, but we will see. I will also check it for true TDC with a spark plug piston stop & temp mark the balancer in both direction and TDC will be in the middle as FTF said. Old school still works fine. :thumbup:
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Re: Correct Timing Marks 240 & 300

Post #10 by old28racer » Tue Jun 11, 2019 10:16 pm

Well I was able to do a little work on my truck today. Installed new spark plugs, Pertronix performance spark plug wires, new distributor cap & rotor.

While the plugs were out I got under the engine to turn the balancer & see where the TDC mark was on the balancer, what type of mark and did they setup the timing using the marks on the cam cover or did they use the passenger side timing plate. First off I found TDC with a spark plug hole piston stop. The balancer has a single square notch & lines up with the -0- mark on the timing plate.

The timing plate is a little different than some I have read about & seen on this site. The ones I have seen on this site go from 0-2-4-6-8 with small V notches & points then a bigger V notch at 10 then three more small V notches 12-14-16. My timing plate has all small notches & points that are as follow 0-2-4-6-8-10-12-14-16.

I connected my timing light to see where the balancer white square notch came out on the plate. I was looking for 10-12 degrees BTDC as a base idle number but it was off the timing plate. Thought through the procedure a few hours later and I had not pulled & plugged the distributor vacuum line. :bang: I will try it again tomorrow.

Thanks for the help guys
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