Timing chain and gear help!

Discussion in 'Small Block Tech' started by 19apollo74, Jul 24, 2016.

  1. Mark Demko

    Mark Demko Well-Known Member

    You must have a 455 not a 350
     
  2. OZGS455

    OZGS455 Oh what a wonderful day!

    Yep, thats correct, my signature states all the info, and my nic is a clue also.
    Edit.
    Ah yes just scrolled back to the start if this whole thread..its concerned with the 350,
    Maybe I shoulda read the whole thread as theres possibly dfferences in engines and clearance issues
     
    Mark Demko likes this.
  3. Mark Demko

    Mark Demko Well-Known Member

    LOL, its cool, I was just scratching my head "4 bolts, theres only two":D
     
  4. Darron72Skylark

    Darron72Skylark Well-Known Member

    Sorry to jump on this thread, but I have the timing cover off my Buick 350 right now and will be replacing the timing set, oil pump assembly, water pump, fuel pump, etc.
    If I read the shop manual correctly, when the two dots are opposite each other (12 o'clock on the crank sprocket and 6 o'clock on the cam sprocket) this also corresponds with TDC for cylinder #1. At least on the Buick 350.
    Is this correct?
    I've seen references elsewhere that suggest that TDC is when both dots are at the 12 o'clock position, but I suspect that is for a Chevy 350. Can anyone confirm which is correct?

    Thanks,

    Darron
     
  5. Mart

    Mart Gold level member

    You have it right. Dot to dot, on compression stroke. Rotor pointing at #1 plug terminal.
    If you had good or great oil pressure, you may not need to tear into the oil pump.
     
  6. Darron72Skylark

    Darron72Skylark Well-Known Member

    Oil pressure was not great before this project, so I splurged and bought the timing cover with a new oil pump assembly from TA. Everything is new, booster plate, shims, pressure relief, it even comes pre-packed with petroleum jelly!
    Thanks for confirming that I’m on the right track!
     
  7. alec296

    alec296 i need another buick

    Should change front cam bearing if oil pressure was questionablely low
     
  8. Mart

    Mart Gold level member

    .

    Or at least verify that it's still in spec.
     
    alec296 likes this.
  9. Darron72Skylark

    Darron72Skylark Well-Known Member

    I can’t seem to get the dots to quite line up. I’ve manually cranked the engine 2-3 times but they always miss. This is as close as I can get it. Am I ok to take it apart like this and just nudge it back together with the new timing set?
    Or is there something else I should do?
     

    Attached Files:

  10. Mark Demko

    Mark Demko Well-Known Member

    If you rotated the crank and cam together clockwise a fuzz, they would line up perfectly:D
     
  11. Darron72Skylark

    Darron72Skylark Well-Known Member

    Well, so far that hasn’t worked. Are you suggesting to put a wrench on each one and wiggle them until aligned? They are pretty close now but not quite there.
     
  12. Mart

    Mart Gold level member

    Yes, don't try & crank using starter, use breaker bar and hand bump. Take #1 plug out and make sure piston is up top, stick pencil in plug hole to feel piston position.

    It looks close enough anyway to take apart.
     
  13. alec296

    alec296 i need another buick

    Looks like the upper gear is worn out. Junk that garbage and spend 15 bucks on a cast iron gear.
     
  14. Darron72Skylark

    Darron72Skylark Well-Known Member

    Had a little trouble removing the distributor gear, chipped some teeth.
    This is the worst looking one.

    Would you all recommend replacing? That’s what I’m thinking, unfortunately.

    On a related note, I think my fuel pump eccentric is shot. Measured the wear groove at 0.55 millimeters with my calipers
     

    Attached Files:

  15. Mart

    Mart Gold level member

    Darron,
    Unfortunately those both look shot....
    Gear would be OK if you didn't chip the teeth.
     
  16. Mark Demko

    Mark Demko Well-Known Member

    Bet that gear was chipped from the factory, replace it tho;)
     
  17. Darron72Skylark

    Darron72Skylark Well-Known Member

    Gear was not chipped from the factory, unfortunately , I did that myself.
    Doh!
     
  18. Mark Demko

    Mark Demko Well-Known Member

    How did you chip it, drop it?
     
  19. Darron72Skylark

    Darron72Skylark Well-Known Member

    No, I didn’t drop it, I was trying to gently work it loose with a couple of screwdrivers. Wasn’t using very much force, just applying pressure by hand. Turns out it’s very brittle.

    Now I know
     

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