johnson 40 hp

[rod087]

Hi i would like if anyone has info on the torque specs for a 40 hp johnson about 1996 and the torque pattern, also the specs for setting the timing and how to go about it.If anyone has this info or a manual with the specs i woould really appreciate it.<br />Thanks<br />Rod

 

[tashasdaddy]

Re: johnson 40 hp

suggest manual available at kencook.com

 

[OBJ]

Re: johnson 40 hp

Hi Rod and welcome!<br /><br />Sounds like your torqueing the head? I do believe the torque is 18 > 20 ft lb. Start with the middle head bolts and work out in a spiral pattern. Use at least two torque settings....example...torque at 10 > 15 first and then again at 18 > 20. <br /><br />An easy way to set the timing (WOT timeing) is to use the procedure posted by Joe Reeves. Keep in mind, if the engine has a quick start feature (don't think yours does) it will have to be disabled. Here's the procedure.<br /><br />(Timing At Cranking Speed 4°)<br />(J. Reeves)<br />The full spark advance can be adjusted without have the engine running at near full throttle as follows. <br /><br />To set the timing on that engine, have the s/plugs out, and have the throttle at full, set that timer base under the flywheel tight against the rubber stop on the end of the full spark timer advance stop screw (wire it against that stop if necessary). <br /><br />Rig a spark tester and have the gap set to 7/16". Hook up the timing light to the #1 plug wire. Crank the engine over and set the spark advance to 4° less than what the engine calls for. <br /><br />I don't know the full spark advance setting your engine calls for, but to pick a figure, say your engine calls for 28°, set the timing at 24°. The reasoning for the 4° difference is that when the engine is actually running, due to the nature of the solid state ignition componets, the engine gains the extra 4°. <br /><br />If you set the engine to its true setting at cranking speed, when running it will advance beyond its limit by 4° which will set up pre-ignition causing guaranteed piston damage! You don't want that to take place. <br /><br />No need to be concerned about the idle timing as that will take care of itself. The main concern is the full advance setting. <br /><br />Be sure to use your own engines spark advance settings, not the one I picked out of the air here in my notes.<br /><br />And if your doing your own maint, do as tashasdaddy suggest and get a manual...best money on an engine you can spend.

 

[rod087]

Re: johnson 40 hp

Thanks for the info, yes I need to torque the head bolts,but for the timing this engine is about 1976 and has point ignition so is it the same procedure to set the timing and would you know how many degrees advance it should be set at.<br />Thanks<br />Rod

 

[Saskatoon2005]

Re: johnson 40 hp

As engine rpm increases, the ignition system must fire the spark plugs more rapidly. Proper ignition timing synchronizes spark plug firing with engine speed.<br /><br /> Timing is not adjustable on engines with a breaker point ignition. Ignition timing with this system depends upon correct initial setting of the breaker point gap. All engines equipped with a breaker point ignition use a point setting of 0.022 in. (new) or 0.020 in. (used).<br /><br /> Timing can be checked with a timing light on engines equipped with timing marks. If the timing marks on the flywheel and armature plate or timing pointer do not align properly, the breaker point gap must be reset.<br /><br /> If the procedure for your engine specifies that the engine be running while setting the timing, the engine must be run at full throttle in forward gear unless otherwise stated. This requires the use of a test tank and test wheel, as timing an engine while speeding across open water is neither easy nor safe.

 

[Saskatoon2005]

Re: johnson 40 hp

Again here is some more information from my clymer manual regarding engines from 1956-1972. Tune-up specifications (1- and 2-cylinder)<br /><br /> 1960 - 1962 Use the Adjustment Procedure #3 and Adjustment method C<br /><br /> 1963 - 1970 Use the Adjustment Procedure #3 and Adjustment Method D<br /><br /> 1971 - 1972 Use the Adjustment Procedure #3 and Adustment Method C again.

 

[Saskatoon2005]

Re: johnson 40 hp

Again here is some more information from my clymer manual regarding engines from 1956-1972. Tune-up specifications (1- and 2-cylinder)<br /><br /> 1960 - 1962 Use the Adjustment Procedure #5 and Adjustment method C<br /><br /> 1963 - 1970 Use the Adjustment Procedure #5 and Adjustment Method D<br /><br /> 1971 - 1972 Use the Adjustment Procedure #5 and Adustment Method C again.

 

[Saskatoon2005]

Re: johnson 40 hp

Again here is some more information from my clymer manual regarding engines from 1956-1972. Tune-up specifications (1- and 2-cylinder)<br /><br /> 1960 - 1962 Use the Adjustment Procedure #5 and Adjustment method C<br /><br /> 1963 - 1970 Use the Adjustment Procedure #5 and Adjustment Method D<br /><br /> 1971 - 1972 Use the Adjustment Procedure #5 and Adustment Method C again.

 

[Saskatoon2005]

Re: johnson 40 hp

Again here is some more information from my clymer manual regarding engines from 1956-1972. Tune-up specifications (1- and 2-cylinder)<br /><br /> 1960 - 1962 Use the Adjustment Procedure #5 and Adjustment method C<br /><br /> 1963 - 1970 Use the Adjustment Procedure #5 and Adjustment Method D<br /><br /> 1971 - 1972 Use the Adjustment Procedure #5 and Adustment Method C again.<br /><br /> Procedure 5 states:<br /> Engines adjusted with this procedure have a fixed pointer on the intake manifold that MUST align with the throttle cam mark.<br /><br /> Throttle Cam Adjustment<br />1. Remove the engine cover.<br />2. Set the throttle grip to the STOP position.<br />3. Install the tool shown in Figure 2 to the end of the cam follower linkage. Bend the tool wire 90 degrees upward for easier viewing. See Figure 3.<br />4. Slowly rotate the throttle grip toward the ADVANCE position until the throttle cam mark aligns with the intake manifold projection. See Figure 12. (typical).<br />5. If the throttle valve is not closed with the cam follower roller touching the cam when the cam mark is aligned with the manifold projection in step 4, use the ADJUSTED METHOD specified in Table 1 as required.<br /><br />Method C - Loosen the throttle arm clamp screw. See Figure 13 (typical). Align the cam mark with the manifold projection and make sure the throttle valve is closed. Turn the throttle shaft eccentric screw until the cam follower roller touches the cam, then tighten the clamp screw.<br /><br />Method D - Align the cam mark with the manifold projection and make sure the throttle valve is closed. Loosen the throttle shaft arm screw. See Figure 14 (typical). Position the cam follower roller against the cam and tighten the screw.<br /><br />6. Manually rotate the armature base (magneto plate) to its full spark position. Adjust the control rod collar to provide 1/32 in. clearance from the pivot pin. See Figure 15 (typical).

 

[rod087]

Re: johnson 40 hp

Thanks for the info, but i do not have a manual for this engine it is approx. 1976 model and its not my boat i have it to sell for someone else thats why i didnt buy a manual for it i thought if someone has a manual they could please send a copy of the pages that show how to adjust the timing.I asked at the dealer in Yorkton but its like national security and they refused to help me out.<br />Thanks<br />Rod

 

[Saskatoon2005]

Re: johnson 40 hp

Try phoning a boat dealer in Saskatoon, and you should get the information you need. Try Pally's performance in Saskatoon. They are very helpful and I deal with them regularly for my 1961 Johnson 40 H.p. Outboard. I bought my spark plug wires recently.

 

[rod087]

Re: johnson 40 hp

Saskatoon2005 for adjusting the throttle cam adjustment i think mine is out,but in the procedure you told me it said to refer to some figures, but i dont see any i dont think they came through could you send it again.My engine i was told is a 1965 model.<br />Thanks<br />Rod

 

[Paul Moir]

Re: johnson 40 hp

Rod, have a look here:<br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=033290#000006 <br /><br />Flywheel nut torque is 105ft/lbs, head bolt torque is 168-172 inch/lbs, here's the pattern:<br /><br />7---8<br />3 o 4<br />2---1<br />6 o 5<br />10--9

 

[Saskatoon2005]

Re: johnson 40 hp

Look at Pauls link...great pictures of what to look for in link and synch. Once again Paul is a pro and pay close attention to his replies...he is the master....you the apprentice.<br /><br />Good luck, looking forward to seeing if it works out for you....now if the rain would just stop so I can bolt down my flywheel and start my motor up. Patience....must have patience.....lol!

 

[rod087]

Re: johnson 40 hp

Hey guys i got it running it starts fine but it is back firing when i speed up the engine.I looked at the throttle cam adjustment and my marks on the cam and intake do not line up even when the throttle is in the middle postion and according to the proccedure it said to slowly open the throttle until the marks line up, well when i open the throttle it move further away from the mark on th intake advanceing the timing.Any suggesting on this. <br />Great help so far guys<br />Thanks<br />Rod

 

[rod087]

Re: johnson 40 hp

Hi there i have my engine running now but it backfires when running and i was wondering if anyone has any idea what could be the cause for this,i gapped the points at .020" and cleaned them im thinking it would be something to do with the spark or could it be possibly the fuel?<br />THanks<br />Rod

 

[Paul Moir]

Re: johnson 40 hp

When it "backfires" is it a loud bang and out the exhaust or more of a sneeze (sometimes out the carb)?<br /><br />Did you get the link & sync right? It's critical that it be really deadly.

 

[rod087]

Re: johnson 40 hp

Hi Paul it is backfiring through the carb and the link & sync i didnt get adjusted because im not sure how to go about it like i said the marks on the throttle cam and the intake pointer never line up even when the throttle is at idle in the middle position, also i noticed that when i move the throttle to WOT that the timing plate hits the stopper before getting to WOT but i dont see an adjustment to move the throttle cam plate to bring the marks into line and what postion should the throttle be at when the marks should line up with the intake pointer.When i got the boat i cleaned the carb and the rich/lean needle was just laying in the engine housing and i couldnt find a spring, but im thinking that there shold be a little spring around the needle to put a little tension on it to hold it at the right adjustment?<br />Thanks for all the help Paul<br />Rod

 

[Paul Moir]

Re: johnson 40 hp

Ok, that's what we call a lean sneeze. It's a little different from a backfire which is normally caused by bad timing. A lean sneeze is caused by not enough fuel getting into the engine. What happens is the fuel charge in the crankcase gets ignited, and it blows out through the reeds or whichever way it can find out.<br /><br />Sounds like someone turned the idle way up to make up for the engine running poorly. Have you tried adjusting the idle stop? Are you on remotes or tiller? I believe there are two idle stops - one on the remotes and one on the gear at the bottom of the throttle tower (the lever that runs vertically along the port side of the engine and turns with the throttle). <br /><br />The rich/lean knob is head in adjustment by it's packing nut, that works like a packing nut on a regular water valve. Are you missing this?<br /><br />The armature plate should hit it's stop at about 2/3rds or 3/4 throttle and then stop moving. That is how it's supposed to work. Actually, when it's just hit it's stop the engine is operating at it's most efficient. After that point, it just pours on the fuel by opening the carburetor's butterfly valve more.<br /><br />Hope that helps!

 

[rod087]

Re: johnson 40 hp

Good day my boat is on remotes,but i still dont know where the link/sync adjustment should be set at like the marks on the cam plate should line up with the pointer on the intake but at what position should the throttle be at when they should line up?As far as the rich/lean knob it does thread into the carb but it is loose and im sure it will vibrate out when the engine is running.What should i check as far as the lean burn condition,should the flote be adjusted and at what height should it be set at? or is it just a matter of adjusting the rich/lean knob to the right setting?<br />THanks<br />Rod