Distributor pull and replace questions

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Ewhitaker0020

Full Access Member
Joined
Apr 21, 2019
Posts
272
Reaction score
90
Location
Kentucky
First Name
Eric
Truck Year
1984
Truck Model
K10
Engine Size
305 5.0
I got my distributor back in. I ended up having to use a long screwdriver to rotate the oil pump shaft. It's facing a little closer to the center of the engine that cylinder #1, but I looked at the marking on the harmonic balancer and it's rotated slightly past the TDC mark, so it should be good.
 

chengny

Full Access Member
Joined
Feb 22, 2012
Posts
4,086
Reaction score
1,008
Location
NH
First Name
Jerry
Truck Year
1986
Truck Model
K3500
Engine Size
350/5.7
I got my distributor back in. I ended udvaance p having to use a long screwdriver to rotate the oil pump shaft. It's facing a little closer to the center of the engine that cylinder #1, but I looked at the marking on the harmonic balancer and it's rotated slightly past the TDC mark, so it should be good.

The oil pump drive shaft isn't part of the timing equation - its just along for the ride. The only reason I mentioned it is because it sucks when you take the time to get your cam and distributor gears all lined up in the proper relation - and then you go to stab but you cannot get the distributor to mate with the oil pump shaft.

Also, it doesn't matter how the distributor is oriented. It can be indexed in any direction - as long as the rotor is lined up with the #1 post when the timing marks are at or near TDC. With these vehicles however, it does become an issue. But that's only due to the limited clearance. The vacuum advance actuator can restrict timing adjustment.
 

rt66paul

Full Access Member
Joined
Apr 16, 2016
Posts
230
Reaction score
109
Location
California
First Name
paul
Truck Year
1991 suburban
Truck Model
2500
Engine Size
7.4
You will still need to put a timing light on it, it should run well enough to drive it to the light if that is what you need to do.
 

Rick Dobbins

Junior Member
Joined
Oct 3, 2019
Posts
25
Reaction score
36
Location
Temecula, Calif
First Name
Rick
Truck Year
1977
Truck Model
C25
Engine Size
454
As you've likely found out, the distributor rotor 'twists' when you attempt to install it, then stops short of going all the way in. It never lines up with the oil pump drive shaft. The easiest way to get it back in: you made a mark where the rotor pointed to, right? Put the dist in with the rotor pointing an inch from the spot (it will stop cuz of the pump shaft), then crank the engine for half a second and it will drop right in. Then spin the dist to the timing mark. You'll be right on! I may take a couple times to get the rotor pointing to where you want it, but you'll get it.
 

AuroraGirl

Full Access Member
Joined
Sep 8, 2019
Posts
9,209
Reaction score
6,193
Location
Northern Wisconsin
First Name
Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
I got lucky and it dropped right in where I took it out with no hassle.
 

Latest posts

Forum statistics

Threads
42,107
Posts
909,213
Members
33,593
Latest member
shake1969
Top