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Joined: Dec 2011
Posts: 28
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2011
Posts: 28 |
I've installed a new distributor in the 1954 235 standard and can't get it running to properly time it. It seems to be firing back against itself regardless of how I rotate the distributor.
I've removed the valve cover to observe #1 cylinder.
I've attempted to place the rotor in the #1 position in the D-cap.
Do I do this with the vacuum line attached?
Any helpful suggestions?
Dave B
I am a retired CA (US CPA) living on Vancouver Island with my bride of 40 years, no dog no cat.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
At idle speed the advance does not get any vacuum but as the throttle plate opens it does get vacuum. The timing should be set with the engine at a slow idle.
I would first set the timing where the engine starts and runs the best with out a timing light and work from there.
Gene Schneider
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Dec 2011
Posts: 28
Grease Monkey
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OP
Grease Monkey
Joined: Dec 2011
Posts: 28 |
I pulled all my plugs so I could turn the engine over until the ball on the flywheel showed up. The first time around it appeared at the #6 point on the D-cap and the second time it landed at the #1 point on the D-cap. I replaced the cap after rotating the timing assembly so #1 was spotted on the rotor point. Voila it started right up. Yahoo. I need to fine tune the timing but I'm off to a good start.
The replacement distributor supplied by Chev's of the 40's is a 1112403 whereas the old one was a 1112388. I understand from other posts that the 1112403 is for 1955 and up but was sold as a replacement for distributors back to 1940. It apparently lacks the degree of mechanical advance the ones it replaced had.
Will I notice a difference and is there a fix to deal with the reduced advance?
Thanks to all for the advice.
Dave B
I am a retired CA (US CPA) living on Vancouver Island with my bride of 40 years, no dog no cat.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
If you set the octane selector to zero and then set the timing to the original suggested specs then advance the timing on the octane selector to about 8 degrees advanced and work from there it will be OK. In other words after the timing is set adjust the octane selector advanced as far as possible with out the engine pinging, turning over hard or running rough.
Maximum advance with the 1955 was only 12 to 14 deg where as the 1954 stick was 24 to 28 Deg at 3500 RPM which would be at about 80 MPH.
You could install the weight springs from your original to pick-up some more advance in the mmid speed ranges.
Last edited by Chev Nut; 09/22/14 06:04 PM.
Gene Schneider
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