74 L48 Distributor Help
Race Director
Joined: Dec 2007
Posts: 14,345
Likes: 4
From: Hartselle AL
St. Jude Donor '09
Pull the rotor cap then lift up and down on the rotor. If it moves the dist. needs to be shimmed/re-shimmed. Also look at the inside of the cap and see if the rotor is damaging the contacts.
Burning Brakes
Joined: May 2008
Posts: 860
Likes: 0
From: Stratford Ontario
They have brass bushings in the housing. As well as the up and down movement, you need to check the side play which can be tricky because the advance will want to rotate. if there is any noticable side play the bushings are shot.
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Sounds familiar from last summer for me. Once they start down that road (yes it starts with clicking) they literally destroy themselves; tach drive debris gets into bushings, shaft is scored, etc. Mine was rebuilt but you do need special tools. Best to buy a re-built one. Or go Chinese if you wish.
Last edited by Paul L; May 11, 2011 at 08:19 PM.
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Sounds familiar from last summer for me. Once they start down that road (yes it starts with clicking) they literally destroy themselves; tach drive debris gets into bushings, shaft is scored, etc. Mine was rebuilt but you do need special tools. Best to buy a re-built one. Or go Chinese if you wish.
GUSTO
Drifting
Joined: Mar 2011
Posts: 1,886
Likes: 9
Difficult to diagnose from here. But we all know the tach drive gearset is relatively fragile. Pull the crossgear and look at it carefully for metal shavings or broken teeth. Often the mainshaft is damaged as well when the crossgear breaks, so you will have to replace them both. If there is any binding in the tach drive cable, it will overload the gearset. So you first have to make sure the cable spins freely, or you will be doing the same job again next month. Pack the gearset with grease when you are done.
