View Full Version : How can you tell if an engine is counter rotation?
Scott Pearson
09-17-2014, 04:16 AM
I'm looking at some engines and they are a pair that came out of a Cigarette. Not sure if one is counter rotation. Is there a way to tell by looking at them on stands? They are 420 Mercruisers.
Any help would be great!
johnnywhale
09-17-2014, 04:42 AM
Pull the valve covers, crank by hand, watch intake valves for firing order?
mattyboy
09-17-2014, 06:30 AM
When you put it in reverse and the bow slams into the dock??
maddad
09-17-2014, 06:32 AM
Check distributor wires for which direction it's spinning to get the right firing order.
CHACHI
09-17-2014, 06:41 AM
When you put it in reverse and the bow slams into the dock??
+1
Ken
BUIZILLA
09-17-2014, 07:00 AM
inlet and outlet hoses on the sea water pump shouldn't match
starter drive teeth angle shouldn't match
harmonic balancer timing marks / tabs shouldn't match
mario
09-17-2014, 07:14 AM
Scott if they were stern drive engs matted with trs drives and trans there both lefty's
joseph m. hahnl
09-17-2014, 08:52 PM
Firing order on the cap. On inboards with Velvet drives The starter is usually bolted on backwards "aft of the engine". I do not believe that there has ever been a reverse rotation Stern drive. But the firing order is truly the best way to tell. Or jump the starter and see which way it cranks:biggrin.:
gcarter
09-18-2014, 06:18 AM
Remove the timing cover and look for a gear drive w/an idler to reverse cam rotation.
Scott Pearson
09-18-2014, 06:33 AM
Thanks for the great info guys. I missed out on these engines...I need to start looking again for a BBC. This guy had 2 and I figured I would buy both.
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