Random rattle at startup after dizzy o-ring replacement

[Alron67]

Hey guys a few weeks ago I changed a brittle dizzy o-ring on my 94. It dosent happen all the time (maybe 1 out of 10 -15 start ups)but when I start it up now I hear a rattle then it goes away. I pulled the distributor again to make sure my marks on the distributor and gear were lined up while at TDC and all looks good. Possibly a bit too much timing? I used a timing light and jumped the diagnostic ports per FSM but set the timing to 7°before TDC. Any help is greatly appreciated. TIA

 

[WCBlueSky]

Recommend using a mechanic's stethoscope to see where the rattle is coming form. On mine, the PAIR reed valve rattles on startup, are you sure it isn't that? Also sometimes mine rattles after I disconnect the battery and it is re-learning the fuel ratio.

 

[Kernal]

Does it "rattle" under load/acceleration?
Is the rattle only when you first start a cold engine?
Did you ever previously hear a start-up rattle?

Did you change the oil at the same time as working on the Dizzy?
If so, was the new oil weight different than what you were using before?
Ditto for the oil filter, different brand?

 

[Alron67]

Recommend using a mechanic's stethoscope to see where the rattle is coming form. On mine, the PAIR reed valve rattles on startup, are you sure it isn't that? Also sometimes mine rattles after I disconnect the battery and it is re-learning the fuel ratio.

I thought the same but it's so random and its only while starting that I can't predict it. Pair reed? Noni haven't considered that. Just hard to catch it or make it happen again. The search continues..

 

[Alron67]

Does it "rattle" under load/acceleration?
Is the rattle only when you first start a cold engine?
Did you ever previously hear a start-up rattle?

Did you change the oil at the same time as working on the Dizzy?
If so, was the new oil weight different than what you were using before?
Ditto for the oil filter, different brand?

No rattling under load or acceleration like it it was too far advanced. Typically it does happen on cold starts. Maybe only a few times while already warmed up. I had a rattle prior but that was the factory side steps that were shaking on the exhaust. Side step have been removed. Nope didn't change the oil change this go round. I just changed the o-ring since it was seeping oil.

 

[WCBlueSky]

Here is the pair reed rattle: PAIR Reed Valve - rattle on startup - https://forum.ih8mud.com/threads/pair-reed-valve-rattle-on-startup.1234776/

 

[Alron67]

Thanks in advance. I just hate to think that I may be doing harm or have to pull the valve cover to line up cam marks since I have being basing TDC off of the main pulley mark.

 

[Alron67]

Here is the pair reed rattle: PAIR Reed Valve - rattle on startup - https://forum.ih8mud.com/threads/pair-reed-valve-rattle-on-startup.1234776/

My 94 did that after I reconnected the battery after the o-ring fix since I pulled the battery and battery box..it stopped after a few minutes of idling and hasn't done it again.