Bryce Mcclintock Posted October 10, 2023 Report Posted October 10, 2023 Hi guys , I have a annoying intermittent miss when Im at constant speed not during acceleration. After some investigation I found I had some play in the distributor, suspecting the bushings I began dismantling to replace them but found they are fine it's actually the cam stop plate that's lose on the shaft . Are these available to replace? or has anyone fitted bushings to the cam stop plate it's self ? Thanks in advance Quote
DJK Posted October 10, 2023 Report Posted October 10, 2023 2 hours ago, Bryce Mcclintock said: Hi guys , I have a annoying intermittent miss when Im at constant speed not during acceleration. After some investigation I found I had some play in the distributor, suspecting the bushings I began dismantling to replace them but found they are fine it's actually the cam stop plate that's lose on the shaft . Are these available to replace? or has anyone fitted bushings to the cam stop plate it's self ? Thanks in advance picture? Quote
FarmerJon Posted October 10, 2023 Report Posted October 10, 2023 What model number is the distributor? There are a wide variety that all basically interchange, but don't all share internal parts. Are there any signs of galling or wear on the top of the shaft that the cam sits on? There is a letter code stamped on the cam stop, you can look for a replacement, but it can be difficult to find NOS ones. Quote
squirebill Posted October 10, 2023 Report Posted October 10, 2023 Do you have an idea of which part is actually worn, the shaft or the stop plate bore? Do you have the spec. for the shaft diameter or the cam stop plate bore? I don't but was thinking maybe the ID of the stop plate bore could be knurled and reamed (like done to valve guides) to make a tighter fit on the shaft.... OR....the shaft could be built up with braze/ silver solder and turned to a larger diameter to make a tighter fit in the stop plate bore. Just a thought. Regards. Quote
Bryce Mcclintock Posted October 10, 2023 Author Report Posted October 10, 2023 Distributor is a IAT 4011A Cam stop plate is stamped RAD.I have 3 parts distributors they all have movement in the cam stop plate , maybe it's normal ? Although I can't see how when it's enough to see points moving ? . Quote
DJK Posted October 11, 2023 Report Posted October 11, 2023 (edited) I have 2 extra distributors 4011 and 4101, both cam stops have no play in them. If you can't source one locally, let me know. Not sure what shipping would be from the USA. Edited October 11, 2023 by DJK Quote
desoto1939 Posted October 11, 2023 Report Posted October 11, 2023 what is a cam stop? Are you talking about the part the cam lobe that is responsible for the opening of the points when it makes contact with the high point when the dissy is spinning? Rich desoto1939@aol.como Quote
desoto1939 Posted October 11, 2023 Report Posted October 11, 2023 Thank you for posting the picture of the cam & stop plate. Since there are holes inthe plate I would assume that there is some type of bolt and nut that holds this unit tight inthe dizzy. Also since there is a spacer could the spacer be missing on the original posters question or could the cam stop plate just need to be tightened? I wuld also assume that these stop plates would be the same in our older dizzy since they were al made by Autolite and have a 38 degree cam angle. Rich Hartung Desoto1939@aol.com Quote
Bryce Mcclintock Posted October 12, 2023 Author Report Posted October 12, 2023 8 hours ago, desoto1939 said: Thank you for posting the picture of the cam & stop plate. Since there are holes inthe plate I would assume that there is some type of bolt and nut that holds this unit tight inthe dizzy. Also since there is a spacer could the spacer be missing on the original posters question or could the cam stop plate just need to be tightened? I wuld also assume that these stop plates would be the same in our older dizzy since they were al made by Autolite and have a 38 degree cam angle. Rich Hartung Desoto1939@aol.com The holes are for the pins from the weights to to locate to control mehcanical advance hence this piece is not screwed down a small spring clip holds I down from the top . It's not the up and down movement that causes the problem it's side to side its the wear between the shaft and the cam stop plate Quote
D35 Torpedo Posted October 12, 2023 Report Posted October 12, 2023 So a guy with a lathe may be able to bore and bush it, otherwise you're up shat creek. I'm glad you mention this, because now it's on my mind. I'll have to check my own dizzy now. Quote
Bryce Mcclintock Posted October 12, 2023 Author Report Posted October 12, 2023 1 hour ago, D35 Torpedo said: So a guy with a lathe may be able to bore and bush it, otherwise you're up shat creek. I'm glad you mention this, because now it's on my mind. I'll have to check my own dizzy now. Yeah went to a engineer today it's not looking good replacement is my best option Quote
D35 Torpedo Posted October 13, 2023 Report Posted October 13, 2023 17 hours ago, Bryce Mcclintock said: Yeah went to a engineer today it's not looking good replacement is my best option A machinist could make you one from scratch. Quote
desoto1939 Posted October 13, 2023 Report Posted October 13, 2023 I have seen these units on ebay but you will need to know your original part number and or autolite part number. My Autolite catalog does not list these parts so i can not provide you with any cross reference numbers. Rich Hartung Desoto1939@aol.com Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.