|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
08-29-2021, 04:13 PM | #41 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,910
|
Re: camshaft (Long)
Even though the engine does not have adjustable tappets, you may want to check the clearance anyway. The red book has a detail description on how to do this.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
08-29-2021, 04:44 PM | #42 | |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
Quote:
John |
|
Sponsored Links (Register now to hide all advertisements) |
|
08-29-2021, 04:53 PM | #43 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: camshaft (Long)
I think if I remember correctly we talked about ignition timing quite awhile ago. And I too still kinda think thats the issue.
|
08-29-2021, 04:57 PM | #44 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: camshaft (Long)
Yep, the 8 cycle Aermotor is a strange animal. The intake is atmospheric and the exhaust is mechanical as many engines of the day were. But that big ole cam gear dictating all those exhaust cycles is unique.
|
08-29-2021, 05:02 PM | #45 | |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
Quote:
Further explanation. The cam gear is 4 times the crank gear for the 8 cycles. Intake, compression, power, exhaust, the next 4 cycles (2 revolutions of the crank) the exhaust valve is open due to cam profile. Then we start over. Interesting fact is that the exhaust exits towards the exhaust cage for cooling. Of course engine is air cooled. John |
|
08-29-2021, 05:11 PM | #46 |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
Sponsored Links (Register now to hide all advertisements)
Thanks, John |
08-29-2021, 05:53 PM | #47 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,910
|
Re: camshaft (Long)
From the front of the car, the crankshaft rotates clockwise, so the camshaft rotates counter clockwise. The gear teeth on the cam gear are right handed, so as the cam moves forward the cam moves counter clockwise, and thus advances the timing. However, the gear in the center of the camshaft will retard the timing as the cam is moved forward. I don't know which effect dominates or whether they cancel each other out to a net no change.
I suspect that you will find the thrust plunger and spring are OK, or not damaged to the extent that they would cause the problem you are experiencing. Updraught had a valid point. There may be an advance mechanism somewhere. It would be easy to test this by hand moving the rotor while the distributor is in the car. If it moves more than a small amount there is an advance mechanism somewhere.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
08-29-2021, 08:27 PM | #48 | |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
Quote:
with the front seal, draining and replacing the oil and cost of the parts and oil isn't exactly a easy or cheap 10 minute job. What do you think the problem is? Thanks, John Last edited by aermotor; 08-29-2021 at 08:57 PM. |
|
08-30-2021, 05:04 AM | #49 |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
[QUOTE=Tom Wesenberg;2050854]I can't think of any roll pin. Where is it located?
I suppose everyone is as tired of this thread as I am & I started it. Concerning the above, Tom's post # 28 and Patrick L.'s post # 29. I can't post a picture but refer to Bratton's pictures for part #9550 and #9551. The shaft pictured will not come out of the block without separating these parts. Nowhere could I find this out without doing it and I guess no one really needs to know or care except an overhauler. Thanks, John Last edited by aermotor; 08-30-2021 at 05:10 AM. |
08-30-2021, 05:30 AM | #50 |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
If any one still thinks I know nothing about Model A engines, timing, trouble shooting, 4 stroke engines or I am a smart "arse", and feel offended by any one - my previous threads or responses included, I will take my tools, go home and quit the Barn.
John Last edited by aermotor; 08-30-2021 at 05:41 AM. |
08-30-2021, 06:10 AM | #51 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: camshaft (Long)
Seems to me everyone is/was trying to help and be friendly.
|
08-30-2021, 06:51 AM | #52 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,910
|
Re: camshaft (Long)
Hi John,
Everyone is trying to help and no one thinks you are a smart a@@. Regarding checking the plunger at the front of the engine. The easiest way to work on the front of the engine is to take the radiator out first. It can be done without doing that but with the radiator out of the way it is much easier. Follow the instructions in Les Andrews' book, Model A Ford Mechanics Handbook, Vol. I for changing the timing gear, page 1-324, but don't change the timing gear, just check the plunger. After getting everything out of the way you just have to remove the timing gear cover. You can re-use the gaskets by cleaning them up and using a small amount of gasket sealer of your choice. Getting the response you got from the advance lever, I would have just adjusted the distributor cam a little more retarded regardless of where the timing pin dropped into the recess. On a more modern engine you can just rotate the distributor body until the engine runs the best. I wish you could do that on a Model A, and perhaps you could by having the distributor not set in the pin and not tightened down, just to test the timing. When you get the engine back together let me know and I will drive down to Greenville to help you. I have over 60 years experience with Model A's.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
08-30-2021, 08:13 AM | #53 |
Senior Member
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
|
Re: camshaft (Long)
|
08-30-2021, 08:19 AM | #54 | |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: camshaft (Long)
[QUOTE=aermotor;2051133]
Quote:
Apparently Tom and I didn't realize that was the pin you were talking about. I was confused, which is normal. I think that is a common roll pin. |
|
08-30-2021, 08:29 AM | #55 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: camshaft (Long)
|
08-31-2021, 03:08 PM | #56 | |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
Quote:
Many Thanks, John |
|
08-31-2021, 06:31 PM | #57 |
Member
Join Date: Apr 2013
Location: Hagerstown, MD
Posts: 32
|
Re: camshaft (Long)
Aermotor
I’m an amateur at working on A’s but here’s one that happened to a friend and I- the timing linkage was hitting the top of the head when advanced and it would lift the distributor plate out of kilter causing us to chase our tails for awhile. Probably not your problem but it’s very easy to check before pulling the timing cover. Roy |
08-31-2021, 07:58 PM | #58 |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
[QUOTE=28PHAETONROY;2051758]Aermotor
I’m an amateur at working on A’s but here’s one that happened to a friend and I- the timing linkage was hitting the top of the head when advanced and it would lift the distributor plate out of kilter causing us to chase our tails for awhile. Probably not your problem but it’s very easy to check before pulling the timing cover. Roy[/QUOTE I will check that closer but I don' recall seeing any problem. I did have it off numerous times so it could have been bent then. Thanks, John |
09-01-2021, 03:50 AM | #59 | |
Senior Member
Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
|
Re: camshaft (Long)
[QUOTE=aermotor;2051787]
Quote:
Thanks, John |
|
09-03-2021, 04:45 PM | #60 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,910
|
Re: camshaft (Long)
I drove down the Greenville today, 3 hours each way, and was able to help John sort out his ignition problem. The timing was not correct. John had done everything correctly but not accurately enough. After I adjusted the timing the car started up and ran well. We drove it to a BarBQ place for lunch. It still is popping in the carburetor when backing off, for instance when shifting or coming to a stop. I will have to think about that but it is probably related to the idle adjustment.
John is a real gentleman and it was a pleasure meeting him and being able to help him with his car. He has done a magnificent job restoring his Tudor. His collection of hit and miss engines was a real treat to see.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|