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Engine Cranks too slowly to start when fully warmed up
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Points & Condenser
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Sep 27, 2011, 8:26 AM
Post #1 of 11
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Engine Cranks too slowly to start when fully warmed up
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I have a 1974 Ford with a 302 it is pretty much stock except for a fourbarrel holley and a MSD electronic distributor this is the one that has two switches under the cap to control the vacuum and centrifical advance that are adjustable with selectable settings. Does anyone reading this know what settings are in the ballpark and what degrees to set the timing at. I have set the damper at 6 degrees BTDC with a good timing light but I am not sure how much vacuum advance to run and where to set the switch for the centrifical advance.
What is the proper way to adjust the valves on the 302 I let it warm up and then back off each rocker until it starts to click and then tighten back to the point the clicking stops and lock it there. Once my engine is fully warmed up it will not start because it cranks slow like a dead battery but once it cools after an hour it will start right up.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 29, 2011, 9:57 AM
Post #2 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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Shouldn't have to adjust valves on this. My guess is starter doesn't like engine heat and may crank faster with a good jump as an indicator that cables, connections or battery just doesn't have the amps. If engine is running hot it would be tight when shut off after a run,
T
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Discretesignals
Ultimate Carjunky
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Sep 29, 2011, 1:12 PM
Post #3 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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Another possibility that can cause slow cranking when the engine is hot is too much ignition advance.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Points & Condenser
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Sep 29, 2011, 4:48 PM
Post #4 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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Hey Tom, I appreciate your answer but this started out with a jumped timing chain. I replaced the chain and I know it is right. I have the timing set at 6 degrees before TDC It cranks and starts very good when the engine is cold after it warms up and I try to put it in gear it will stall out unless I keep it running holding down the brake and giving it gas at the same time. After it is fully warmed up (190) if it stalls or I shut it down. I can't start it untill it cools for a while to about (160 or less) It barely turns like it is out of time or the valves are too tight or battery weak. I could try a different battery but I don't think that is it. I was trying to adjust the valves today and the oil that splashed on the headers caught fire. I was able to put it out quickly and no damage. I also found out today that the heads have Positive Stop Rockers because the studs ar larger in diameter near the base than the threaded part of the stud. I found one way of adjusting the valves by making 3 marks A,B,& C and following a sequence of instructions. Do you remember these older Ford 302 This one is a 74 but I believe it has 78 heads on it I bought it as a factory rebuilt long block for my 74 F100 about 5 years ago. I only had 26,000 miles on it when the chain jumped and it was super loose. Tomorrow I will try to get a compression check on it and a vacumm reading also. Meanwhile any Ideas? I am really getting frustrated with this truck. Thanks
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Hammer Time
Ultimate Carjunky
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Sep 29, 2011, 5:14 PM
Post #5 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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I bet you never reset the ignition timing after replacing the timing change which would have disturbed it.
The valves certainly are not your problem with slow cranking.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 29, 2011, 5:43 PM
Post #6 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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I've plain owned more 302s than anyone I know! This one has been messed with. Ya they were newer back then. NEVER HAD TO TEAR ONE DOWN but back then did have assorted cars/vehicles with slow warm starts and about all were lousy battery cables and would put in ONE gauge wire and problems over.
All 1974s were fairly low compression and dogs. Also but too late for that now leaded gas would cause way too high of compression with build up.
Check compression, voltage drop when it acts up is all I can suggest for now,
T
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Points & Condenser
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Sep 29, 2011, 6:16 PM
Post #7 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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Okay Tom and hammer, I'll give all suggestions a try. Just to clear up the situation the motor is not running hot it is fully warmed up and stays at 190 like always. When it is running it sounds good, no skipping but when you put it in gear it is a chore to keep it running. As far as hammer said I reset the timing at 6 degrees BTDC but it runs better at 10 degrees but then it is even harder to start and has that out of time sound to it while cranking. I know it is at TDC because I watched the intake valve of number one close just before the timing mark on the damper and with the spark plug out I can feel the piston push up my pencil and top out at the timing mark. This is a tough one for me. I should of rebuilt my old motor that spun a bearing but I figured it needed a crank and probably everything at 200,000 so I bought this long block from napa auto, bad mistake, I keep finding stuff that is not my year motor and everything has to get matched. I know it is not a 74 because the heads have the air pump ports for the crossover pipe that I had to plug up, when I first got it five years ago. I'll get back to you with a progress report.
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Tom Greenleaf
Ultimate Carjunky
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Sep 30, 2011, 3:10 AM
Post #8 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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One more for now: Don't forget that California had different emissions requirements than other states or places so it's possible a replacement engines were all set to meet that??
T
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Points & Condenser
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Oct 3, 2011, 9:34 PM
Post #9 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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I guess it's time to pull the heads Compression results 1-150, 2-120, 3-120, 4-100, 5-30, 6-30, 7-120, 8-120 I also hooked up 20 psi of air pressure to cylinder 5 and 6 and both intake valves don't seat I can hear the air coming back up through the Carb. I'm wondering if I can just pull and repair the left head (cylinder 5678) any advice?
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Tom Greenleaf
Ultimate Carjunky
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Oct 3, 2011, 10:11 PM
Post #10 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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Unless that is valve issues that engine is JUNK!
T
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Hammer Time
Ultimate Carjunky
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Oct 4, 2011, 3:10 AM
Post #11 of 11
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Re: Engine Cranks too slowly to start when fully warmed up
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That's still not your slow cranking problem tough.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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