l20b timing trouble

[gino_the_terrible]

So, my 76 620 skipped 2 teeth on the cam gear, and having never done it before, my dumb ass made the mistake of not wedging the timing chain.

 

Over the past couple days, I pulled the timing cover, reset the timing, and shoved the tensioner back in place.

 

I have it all back in one piece, and it wont start, I think i messed up with the distributor timing, i didn't know that the oil pump and the distributor

 

were connected, so i just put it in where it fit. All the videos i can find on this are done on v8's, how do i reset the oil pump/distributor timing?

[Draker]

Assuming you have the timing marks correct shown here:

 

 

 

 

You set the distributor to this location:

 

[datzenmike]

Set the crank to TDC #1 cylinder by turning the crank front bolt, NOT the cam sprocket. Bring up to TDC in a clockwise direction and stop. If you over shoot back up 1/4 turn and try again. Five times if you have to to get it right. Only this way will remove all slack from the tension side of the chain and give you a correct measurement of cam timing. Now look at the cam sprocket timing mark...

 

 

Notch in sprocket should be as shown above, or slightly to the right of the line above it. If at TDC Nothing else matters but getting the relationship in the picture. Wedge the chain and remove sprocket  If notch is way off you may need to move the sprocket a tooth or two on the chain and turn cam with vice grips till the dowel pin fits the sprocket (usually #2 hole)

 

Distributor timing is as Draker posted the picture of above.

[Draker]

Credit Mike for those pictures.. they are also conveniently the first that show up on google image search.

[distributorguy]

I sure hope while you had things apart you replaced both timing gears, the chain, and the tensioner, correct?  Only severely worn parts will allow the chain to jump 2 teeth.  If not, you'd better expect to be doing this over and over again.  Less than $100 to do it right...

[banzai510(hainz)]

I never heard of jumping 2 teeth unless the tensioner just disentigrated

[Roadster-ka]

I've seen them jump 3 and 4 teeth when a wooden chain block was left in after head repair!

[Three B's Racing]

Teeth jumping in an L Motor would indicate an issue some where.

 

1.Loose timing guide/guides

2. no oil pressure at tensioner or badly worn or missing spring

3. So badly worn sprockets that you'd be a blind man to miss that

4. Forgot to install tensioner<--see #3 about being blind DOH!!