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Username Post: SBC timing gear and chain install        (Topic#276023)
dc_motruck 
Forum Newbie
Posts: 53

Loc: Rural Missouri
Reg: 02-01-10
02-06-12 11:52 AM - Post#2187815    

I need some expert info to settle a debate. When installing a new timing gear & chain on a small block chevy (a 1988 5.7 TBI) where are the dots on the gears supposed to be when #1 cylinder is at TDC on compression stroke?

What would be out of whack if #1 was TDC on compression and the dots were lined up with each other (crank gear dot at 12 oclock and cam gear dot at 6 oclock) ?

 
aghaga 
"4th Year" Silver Supporting Member
Posts: 1774

Age: 60
Loc: Altavista, Va.
Reg: 07-05-08
02-06-12 12:21 PM - Post#2187819    
    In response to dc_motruck

#1 on comression will be with both the crank dot and the cam dot @ 12 o-clock. With the crank dot @ 6 o-clock cyls. 4&7 will be on TDC.

 
62chevy427 
"8th Year" Silver Supporting Member
Posts: 1800
62chevy427
Loc: laurens sc
Reg: 04-13-06
02-06-12 12:24 PM - Post#2187820    
    In response to dc_motruck

the dots should be - crankshaft at 12 oclock and camshaft at 6 oclock. when installing distributor with this set up,the rotor should be ready to fire on #6. never did like that. it has caused me lots of confusion until i figured it out. now,after installing a timing chain and gears,after turning the engine at least 2 turns to verify a correct installation,i leave it with the crank and the cam at 12 oclock. that way i can install the distributor to fire #1 cylinder. i install it so that the rotor is just past the #1 post on the distributor cap.squirt some gas into the carb and it will crank up right away. then set timing etc.
56 bel air ((since 2002)
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grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16202
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
02-06-12 01:00 PM - Post#2187832    
    In response to 62chevy427



http://forum.grumpysperformance.com/viewtopic.php?...

http://forum.grumpysperformance.com/viewtopic.php?...
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 02-06-12 01:02 PM. Reason for edit: No reason given.

 
dc_motruck 
Forum Newbie
Posts: 53

Loc: Rural Missouri
Reg: 02-01-10
02-06-12 02:37 PM - Post#2187866    
    In response to grumpyvette

Thanks. That's where the confusion was... what cylinder was at compression when the dots were facing each other (12 & 6 oclock).

 
MikeB 
Senior Member
Posts: 9487
MikeB
Loc: Plano, TX
Reg: 08-28-03
02-08-12 12:01 PM - Post#2188535    
    In response to dc_motruck

#6 is at TDC compression when dots are next to each other.

1982 C-10 SWB pickup -- Unmolested, original paint, 250 six, 3-speed (soon to be 350 Vortec & TH350)

Sold my 55 sedan in June 2014, having owned it 11 years.


Edited by MikeB on 02-08-12 12:03 PM. Reason for edit: No reason given.

 
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