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Timing Question |
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WakeFox 
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Joined: June-29-2007 Status: Offline Points: 10 |
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 Topic: Timing QuestionPosted: July-19-2007 at 9:21pm |
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Hello all. At the risk of sounding like a complete moron, what is the correct timing procedure for a 1993 Ski Nautique with the basic 351 PCM. I am new to the boating repair thing and just want to do this right. I noticed no advance outside of the dist, so I believe it is internal with springs or something? does this have to be disabled like a vac advance? Any help will be greatly appreciated!
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: July-19-2007 at 10:01pm |
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no vaccum advance on boats. Hook a timing light up and go to town. place the trigger lead on the front cyl on the drivers side and set it at 8 btdc. unless it the protec and then you cannot adjust timing.
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WakeFox
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Posted: July-20-2007 at 2:01pm |
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THANKS! What do you recommend setting the idle at?
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21192 |
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Posted: July-20-2007 at 2:11pm |
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With my motor mostly stock (only a DUI ignition upgrade), my boat ran well at 14 degrees initial. I think the stock recommendation is 8-10 degrees.
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Seperator
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Joined: May-23-2005 Location: United States Status: Offline Points: 64 |
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Posted: July-20-2007 at 2:30pm |
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err....dosent that engine have the Protec ignition?
If so....Watch out!!!! The timing procedure is different. |
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TRBenj
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Posted: July-20-2007 at 2:39pm |
Maybe, maybe not. It was available in '91 but I have seen base 351w's as late as '94 that were basic 240hp reverse rotation motors, and did not have Protec. |
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WakeFox
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Posted: July-20-2007 at 2:51pm |
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I do have the reverse rotation 240. Nothing fancy as far as upgrades. Just did a carb rebuild and tune-up and wanted to check the timing. But being a car guy, no advance threw me off.
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Darrel
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Joined: June-16-2004 Location: United States Status: Offline Points: 340 |
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Posted: July-20-2007 at 5:35pm |
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Why is the motor reverse rotation? I thought the pcm 1.23 trans reversed the prop?
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TRBenj
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Posted: July-20-2007 at 5:37pm |
It does. He must have a 240hp reverse rotation and 1:1. My friend has a '94 with that combo, as does Randy in Ohio. |
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Munday
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Joined: August-17-2004 Location: United States Status: Offline Points: 538 |
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Posted: July-20-2007 at 5:44pm |
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Do ypur plug wires come out of the distr. cap?
If yours don't and come from the rear out of 4 coil packs then it is pro tec. Which calls for 18degrees BTDC @ 700 RPM you have to also un hook the knock sensor which is located in the rear of passenger side head(green wire I think) Should also check at3600RPM for total advance of 30 degrees BTDC Good luck Munday |
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WakeFox
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Posted: July-21-2007 at 3:42am |
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It has the 1:1 tranny. The wires do come out of the cap. I put the timing to 10 BTC @ 750 RPM's. Seems to run real good there. Going out to the lake tomorrow. Hope it stays running good? Thanks for all the advice! You guys seem to know your stuff...
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: July-22-2007 at 12:01am |
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should be 600 rpm in gear.
FYI you cannot adjust timing on the protec system it uses a crank sensor to fire and the advance and timing are comtroled by the electronics. |
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Seperator wrote: