Timing Question

[ddbyrd3]

1981 140 Johnson J140TXCIM, I set the timing at 24* static, I backed the boat up into the water to verify under load and it was still 24*.<br /><br />The book says to allow the timer base to rest firmly against the stop regardless of RPM reading. (mine I believe, was @ 3500RPM)<br /><br />I thought the power packs were to make up the additional 4* to max at 28*.<br /><br />Is this a sign of bad power packs or do I need to set my timing to 28* initial?

 

[ddbyrd3]

Re: Timing Question

Anybody??????????????????

 

[ondarvr]

Re: Timing Question

The RPMs (3,500) might be a little low to get the 4* advance from the power pack, normally 5,000 is recommended to check it.

 

[OBJ]

Re: Timing Question

Ondarvar is right dd....you need to check the timing at WOT at least 5k rpm. Best to do with boat in the water unrestrained. Then you can tweek it from there.

 

[ddbyrd3]

Re: Timing Question

Thanks guys, the motor wont pull 5000k restrained on the trailer, or in the water for that matter. 4500k maybe..... maybe<br /><br />I began a link (Engine swap (repower) and have posted all I have done to find the power robbing problem but no one was responding so I started this link.<br /><br />My manual says for my model year that the timing base arm just needs to be firmly against the stop, with prop engaged. Can I trim the motor to be in the water enough to get water to the intake and prop or do I need to have it fully submerged??

 

[ddbyrd3]

Re: Timing Question

I read my manual again this morning, for years 1978-1981 for setting full advance that the timing base just needs to rest firmly against the stop.<br /><br />Is this the case of should I put it back in the water and try for 5000k.<br /><br />My manual says: <br />1973-1981: timing base firmly against the stop.<br />1982-19?? 3500RPM Minimum<br />All others: 5000 RPM Minimum...<br /><br />When I set my timimg under load conditions as described above, I could only acheive 24*. I adjusted my timing to 28* by turning the stop out 4 turnes and checking with a timing lite.<br /><br />Should I back it back off to 24*, how can I test my power packs to see if they are working correctly to advance the motor to 28*???

 

[Basscat 1]

Re: Timing Question

Originally posted by ddbyrd3:<br />When I set my timimg under load conditions as described above, I could only acheive 24*. I adjusted my timing to 28* by turning the stop out 4 turnes and checking with a timing lite.<br /><br />Should I back it back off to 24*, how can I test my power packs to see if they are working correctly to advance the motor to 28*??? [/QB]

I would definately wait for an answer before proceding. I am sorry I cant help you, but somebody on here can. I do know you need to be careful when adjusting the wot timing, because you can do some major damage if you adjust it wrong.

 

[ddbyrd3]

Re: Timing Question

So could power packs be the cause of the motor not advancing itself, or should I set the timing at 28*???<br /><br />My manual doesnt say anything about setting the timing 4*'s short of max.

 

[Silvertip]

Re: Timing Question

If timing is supposed to be set at 5500 RPM, you are 1000 rpm short and won't see that extra advance. You don't even need to run the engine to set max timing. You do need to rig up a spark tester though so the plugs can fire. Hook up each plug wire to the spark tester and move the throttle wide open so the spark advance lever is against its stop. Connect timing light to #1 and spin the engine. Set timing 4 degrees less than specified (if yours is 28 degrees, set it for 24). Your done. The packs will make up the other 4 degrees.

 

[ddbyrd3]

Re: Timing Question

Upinsmoke, I did that already, I was verifing the timing under load conditions to make sure the power packs were doing there job.<br /><br />My motor will not pull 5000k under load conditions, thats why I am asking the question, could the power packs cause the timing NOT to advance itself the additional 4*'s???????

 

[Dhadley]

Re: Timing Question

The additionl advance is not a physical function of the pack but rather an electrical function (rise and fall time). If you could get 4500 and the timing was at 24*, then you could advance the timing stop 2 turns out and your timing should go to 26*.<br /><br />By theory if youre at 24* at 4500 youll be at 25* at 5500. <br /><br />This is exactly why we set it and then check it under a load. If you couldnt get more than 4500 try pulling the trailer ahead slightly or raising the trim some.

 

[ddbyrd3]

Re: Timing Question

DHadley thanks, so bottom line is this; I need to<br />set my timing at 24* and see what max RPM I can pull under load contitions.<br /><br />If I am able to pull 5000k under a load, than I should be fine on the timing, am I understanding that correctly?<br /><br />Depending on what my max (under load) RPM is, will determine what I need to set my static time at....

 

[ddbyrd3]

Re: Timing Question

Last question, and I wont bother anymore on this topic......<br /><br />I have read my book forward and backward in regard to timing a 1981 140 V4.<br /><br />It says to set max timing to 28*. It says NOTHING about setting it at 24* and allowing for the system to make up the additional 4*.<br /><br />Is this an under written rule, or does that not apply to my motor configuration.<br /><br />Also my manual says the timing base must rest firmly on the stop under load conditions for my year. It specifies certain RPM ranges for other years, but not mine....<br /><br />Can someone clear up my confussion???<br /><br />PLEASE!!!!

 

[kirkland]

Re: Timing Question

I used this method in setting the timming for my motor and it worked perfectly...<br /><br />What this method does is allow you to set the timming to a safe and very close to dead on without the motor running ..when the motor is running above 5K you should see an increase in timing of approx 4* so if yours calls for 28* and you set at 24* then you should be in the ballpark..but the only way to tell is to verify this under load above 5K... the proper procedure requires a test wheel and tank ...but since were doing this on the cheap and simple we are getting it close then verifying that under load at WOT your timming isn't advanced over acceptable recomendation which will cause motor failure. running motor at 27 when it calls for 28 will not harm motor might have less perfomance,,, However running it at 29 or 30 will cause you to search for new motor in near future.... Hope this helps clarify this...<br /><br />your manual seems to tell you what the Minumum RPM should be 5K...<br /><br />

<br />My manual says: <br />1973-1981: timing base firmly against the stop.<br />1982-19?? 3500RPM Minimum<br />All others: 5000 RPM Minimum...<br />

although i'm not looking at your manual so hard to say .........<br /><br />Again hope this helps......

 

[Dhadley]

Re: Timing Question

Thats correct. No matter how you set the timing for starters it needs to be checked under a load. The service manual doesnt refer to it because they instruct it to be set under a load using a test wheel. In the field we just figured out what worked, in a general way. <br /><br />And yes, the timer base must be aginst the stop. Thats what determines the total timing.