T_bones

Need some help... Im a little confused..


Firing Order 1-3-4-2

I know when the Up Mark on cam gear are pointing up number 1cylinder is TDC.
Up marks to the right number 2 cylinder TDC.
Up marks to the left number 3 cylinder TDC.
Up mark pointing down number 4 is TDC.


Ok so when your in front of car looking at motor which cylinders are which?
How does it go looking at them?

1-3-4-2?
4-3-2-1?
2-4-3-1?
1-2-3-4?



Thanks.

iBrandon

standing in front of the car..

-----------------
(4) (3) (2) (1)
-----------------

^
Front of the car

T_bones

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iBrandon &raquo;</TD></TR><TR><TD CLASS="quote">standing in front of the car..

-----------------
(4) (3) (2) (1)
-----------------

^
Front of the car</TD></TR></TABLE>


That was fast. Thanks

lVlemphizStylez

when it is tdc for 1 it is also tdc for number 4...vice versa with 2 and 3...Only when ignition timing is a factor is when the above cant be used because its only firing on one piston at a time but both are at TDC (intake stroke and exhaust stroke)

helpful tip if youre doing a valve adjustment or something to save time (ive seen tards go all the way 180 and be like thats TDC for number 4 and not realize nothing has changed in the valve train department)

PatrickGSR94

iTrader: (1)

TDC by definition refers to top of piston travel on the compression stroke, which is when all valves are closed. When 1 is at TDC, 4 is also at the top of its travel, but the exhaust valves are closing and the intake valves are opening, and actually there is a bit of overlap where both intake and exhaust valves are open slightly at the same time. If 1 is at TDC and you're adjusting valve lash, you cannot adjust valve lash on #4.

Now when doing a valve adjustment, all valves must be closed, which simply means the cam lobes are not touching the rocker arms. You don't have to be EXACTLY at TDC when doing a valve adjustment, just look at the cam lobes and make sure that all 4 of them are pointing up and away from the rocker arms on whatever cylinder you're adjusting.

lVlemphizStylez

remove your valve cover...look again...its not opening the valves on 1 or 4...ive done my valve lash like this for a while and it works out just fine