Uniflite members:
I recently put up a post about which engines that I have. I have
since learned how to tell as the most that you will find will say turn
it over with the starter or things like that. Well, first of all, if
you are asking that question, it is because your boat probably doesnt
run or your possibly missing the starter or whatever. Why would you
care otherwise if they are running. 1) If you have a heat exchanger,
look at the raw water pump. Pull off the hose that goes to tranny or
H.E. turn pump by hand to see which way it draws the water from the
hull and that will tell you direction of crank. 2) If no raw water
pump, remove dist. cap. ALL GM distributors rotate clockwise reverse
rot. or not. Turn over motor by hand with 1/2 drive ratchet and look
at the rotor button to see which way it spins. ALWAYS CLOCKWISE
ROTATION. that will give you your answer. 3) Usually the standard
rotation engine will have the standard firing order of 1-8-4-3-6-5-7-2
in the cast of the intake near thermostat housing. This is not always
the case as if you had a bad intake, you would probably go get one for
a Chev truck for $50 bucks, rather than $500 for a new one because of
some numbers bieng wrong. That was the case with mine as both intakes
were the same. Check other methods I listed if you have same firing
order on both. 4) if out of the water, check rotation of prop. Does it
spin clock wise? if so than this is your standard rotation engine. 5)
If it is mercruiser, they all spin clockwise and have rotation
reversed in the tranny. 6) Usually V-Drives will have a higher gear
ratio on the side of standard rotation. Hope this helps and all info I
have listed worked for me on my 1980 twin 350's. Be aware that by the
early 90's and some late 80's, they all have a clockwise crank
rotation and are reversed in the trans.
FIRING ORDERS------------------
STD. ROTATION- ALL GM V-8
---FLY WHEEL---- 1-8-4-3-6-5-7-2
8 7
6 5
4 3
2 1
* CRANK TURNS CLOCKWISE FROM DRIVE PULLEY*
REV. ROTATION
---FLYWHEEL---- 1-2-7-5-6-3-4-8
8 7
6 5
4 3
2 1
*CRANK SPINS COUNTER CLOCKWISE FROM DRIVE PULLEY*
Hope it helps you. Some older models of GM motors Pre 78 I believe
have a different reverse rot. firing order. Call a marine shop to
verify the stamping number on the front left of block where intake
meets top of block. Good luck and happy boating!
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