Jump to content

1974 620 timing degrees


Richie

Recommended Posts

  • Replies 55
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

1 hour ago, datzenmike said:

So I take it the vacuum advance is not working???

 

What about the timing not advancing when revved up. This would be the mechanical or centrifugal advance. It's not working either???? Both not working???

So the rod in the video is moving, and the vacuum is hold pressure. It is just not moving the whole unit as if it is advancing. Yes when i rev the engine the timing does not advance. 

  • Like 1
Link to comment

The breaker plate may be seized and why the rod tries to move but can't. Grab the plate the points are on and try turning it. It may let go.

 

Same with the rotor. Grasp the rotor and turn to try and loosen it.

 

 

Next is take it apart and loosen everything and grease it. Running without either is not good for performance or mileage.

  • Like 1
  • Thanks 1
Link to comment

Pay attention to the clocking of the distributor cam when you remove it. If you put it on backwards, your timing will be 180 degrees out.

 

Also, pay attention to the spring tension on the weights. If there is no tension or the springs are loose, this could cause your timing to come in right away, which is why you're not seeing it move. Likewise if the springs are too tight. Ideally, the springs would be just touching the weights and the tabs holding them on the other end. If they are loose, you can bend the tabs with a pliers.

 

This isn't hard, but should be done by someone who knows what they are looking at.

  • Thanks 1
Link to comment
57 minutes ago, Stoffregen Motorsports said:

Pay attention to the clocking of the distributor cam when you remove it. If you put it on backwards, your timing will be 180 degrees out.

 

Also, pay attention to the spring tension on the weights. If there is no tension or the springs are loose, this could cause your timing to come in right away, which is why you're not seeing it move. Likewise if the springs are too tight. Ideally, the springs would be just touching the weights and the tabs holding them on the other end. If they are loose, you can bend the tabs with a pliers.

 

This isn't hard, but should be done by someone who knows what they are looking at.

https://imgur.com/eoUP97K

 

https://imgur.com/eoUP97K

 

https://imgur.com/zQbxuo9

 

https://imgur.com/5JS71RI

 

So i think I fixed it. does this look correct? The hand pump was holding pressure because it was hard to seal the hose on the vacuum. I used my mouth in one of the videos. 

Link to comment

Good, so you have determined that the vacuum advance is working.

 

Now, grab hold of the metal portion that the rotor slides onto (this is the distributor cam) and hold the base of the distributor shaft, at the bottom where it stabs into the drive spindle.

 

While holding firm the base of the distributor shaft, can you rotate the distributor cam at all? If so, how much tension is there? I mean, how hard do you have to work to twist it? A lot? A little? Does it move at all? This is what's known as mechanical advance.

Link to comment
22 minutes ago, Stoffregen Motorsports said:

Good, so you have determined that the vacuum advance is working.

 

Now, grab hold of the metal portion that the rotor slides onto (this is the distributor cam) and hold the base of the distributor shaft, at the bottom where it stabs into the drive spindle.

 

While holding firm the base of the distributor shaft, can you rotate the distributor cam at all? If so, how much tension is there? I mean, how hard do you have to work to twist it? A lot? A little? Does it move at all? This is what's known as mechanical advance.

It moves a little, some tension is on it like there are springs holding back almost. I can also hear it when i move it. Does take some strength but not to much. It doesnt move a lot just a little bit

Edited by Richie
Link to comment

so i hate to admit this but, when i was putting in the electronic pickup I must have not attached that black screw back onto the vacuum advance correctly. because when i took it apart I noticed the shaft wasnt screwed into the plate to move it....

Link to comment
2 hours ago, Richie said:

It moves a little, some tension is on it like there are springs holding back almost. I can also hear it when i move it. Does take some strength but not to much. It doesnt move a lot just a little bit

 

Does it spring back?

Link to comment
5 minutes ago, banzai510(hainz) said:

Personally I dont think the dist is bad.

a video of the motor running with the timing light  on the crank would have helped better to see whats it doing. at idle and rev up and adjusting the dist adv and retard

I did post one on this thread

Link to comment
22 hours ago, banzai510(hainz) said:

Personally I dont think the dist is bad.

So now that all the work is done, you weigh in with your opinion...? 😁

 

Yeah, it appears that the distributor is not the problem. But without being there and seeing for myself, who knows.

Link to comment
23 hours ago, datzenmike said:

 

The distributor wasn't advancing  at all when revved up. It was shown that the vacuum advance was also stuck or inoperative. Work has been done on both these problems so time for an up date.

 

Is this advancing to 32 degrees above 3k????????

Does the advance jump up when held at fast idle and suddenly let off???????

Link to comment
6 hours ago, datzenmike said:

 

The distributor wasn't advancing  at all when revved up. It was shown that the vacuum advance was also stuck or inoperative. Work has been done on both these problems so time for an up date.

 

Is this advancing to 32 degrees above 3k????????

Does the advance jump up when held at fast idle and suddenly let off???????

So i hooked up the dizzy today, and reved it up and it sounds so much better now. I didnt have a timing light to see the degrees but before I broke down the dizzy, I could only rev it up 3k rpm until the the carb started back firing. Now it hold and no back firing.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.