New Engine wont run, firing order

[simont26]

Hi guys you may have seen my other post "what year is my nautique?" here: http://www.planetnautique.com/index....ic&t=15011

I have yet another problem due to my lack of knowledge on this stuff. I replaced the engine due to there being a hairline crack somewhere on the block which was then mixing water in with the oil. after changing the main block, its a Ford 351 Windor V8 by the way.

The petrol wasnt being pumped up to the Holly Carb which turned out to be the manual pump. Easy fix even just for the time being was to change to an electric pump which is now letting the fuel flow to the carb.

Now i am puzzled, is there one set firing order for these engines? I have seen 4 different ones 2 for left rotation and 2 for right. As i say i dont know anything about this. If anyone could shed some light on this area i very much appreciate it.

The distributor turns clockwise and the engine rotates ant-clockwise if this is at all helpful.

, Si

[2gofaster]

RE: New Engine wont run, firing order

1,3,7,2,6,5,4,8 is the firing order.

[DanielC]

RE: New Engine wont run, firing order

Worst case, you can always pull the valve covers off an unknown engine to figure out the firing order.

[WakeSlayer]

RE: New Engine wont run, firing order

If your motor turns counterclockwise from the perspective of facing the rear of the boat., you have the wrong engine in it. They are supposed to have a RH rotation engine.
When you replaced the motor, did you just swap the parts over? Disty, starter, etc? Was it the original engine?
If you had the original engine and swapped parts, it is not going to run. You also need to re-index the trans pump.

Make sure you have the correct marinized parts for it if you are going to leave it in there. However, you can get the correct engine for your boat for ~$1000

[TRBenj]

Re: RE: New Engine wont run, firing order

1,3,7,2,6,5,4,8 is the firing order.

Uh, not if he's got the original RH 351w.

All RH 351w's use the same firing order: 18456273

Sometime around '72 or so, the 302 started using the 351 firing order as well. The 260, 289 and very early 302's were slightly different.

Wakeslayer is on the right track here. Your starter is spinning the motor backwards. All Windsors (both RH and LH) spin the rotor counter clockwise when viewed from above- at least when the engine is cranking or running forward! If its going clockwise, youre trying to spin it backwards. This commonly happens when a automotive or LH starter is installed on a RH engine- but your case may be the opposite (original RH starter installed on a new LH engine perhaps?).

[harddock]

RE: Re: RE: New Engine wont run, firing order

or because of rotation you are on the wrong side with #1 throwing everything off.

[WakeSlayer]

RE: Re: RE: New Engine wont run, firing order

He said he replaced it above, I am guessing LH auto motor went back in.

[simont26]

RE: Re: RE: New Engine wont run, firing order

sorry im just getting back now been away for a few days. Basically all that was used from the new engine was the main block. both heads, carb, front plates/belt parts, water heads and any other marinisation parts where built back onto the new block if that makes sense. From the dashboard looking towards the back of the boat the engine rotates anti-clockwise.

Worst case, you can always pull the valve covers off an unknown engine to figure out the firing order.

Would it be too complicated to explain how to do this? To be perfectly honest i dont have a clue and being from the UK its a nightmare trying to get parts, original or not lol

[DanielC]

Unknown engine, Firing order

OK, worst case scenario.
All you know is that you have a V-8 engine. You do not know what direction it turns, you do not know the firing order, and you do not even know how the cylinders are numbered. GM, and Ford use different numbering systems.
On V-8 engines used in boats, the front of the engine is the end away from the flywheel. It is the end with the water pump. Look sideways across the engine, and one cylinder bank will be slightly ahead of the other bank, by the width of a connecting rod bearing, about 3/4 to 1 inch. (19 to 25 MM)
The front cylinder, farthest ahead is number one.
Pull the valve covers off. Remove the spark plugs.
Watch number one cylinder rocker arms, as you turn the engine by hand.
With the valve covers off, you should see by the exhaust manifold, and intake manifold, what valve rocker is the intake valve rocker, and the exhaust valve rocker.
When you are turning the engine in the correct direction for its rotation, the exhaust valve opens first, and just as the exhaust valve finishes closing, the intake valve will start to open. At top dead center on that cylinder, you can rock the crankshaft back and forth a few degrees, and watch both rockers move.
Now you have top dead center on number one cylinder located, and the direction the engine rotates.
Turn the engine 90 degrees in its normal direction of rotation, and rock the crankshaft again, looking for two rocker arms on one cylinder moving. That is the second cylinder in the firing order.
Turn the engine another 90 degrees, rock the crank, and find the third cylinder.
Keep doing this, until you have rotated the engine two whole turns, and you should be back at number one cylinder.
That is your firing order.