timing are there two bb's on the flywheel, won't start

[mwsaling]

Hi all:

I have searched for a thread like what I am about the present but could not find any. I am trying to get my 77 fj40 to run after a dissy swap with an 84. I have aligned the rotor to the number one position on the cap with the bb or O on the rotor. I then try to start it up and nothing. I tool the cap off and the rotar was 180 from where it was when I placed it to start off with (this after the bb was aligned again). I then took the dissy out and placed it in the number one position again when the bb was right on the mark in the timing window. Nothing again so I took the dissy off again and it was 180 away (after I had it aligned to the bb in the window again). I knew the dissy couldn't slip so I figured maybe there are two bb's on the flywheel and holy ***t there were. I pushed the vehicle, with the dizzy off, and watched the rotor and sure enough there was one bb and when the rotor hit 180 from the previous time I had seen the bb there was another one. Unless the fly wheel spins twice as fast and there is only one bb and I am just seeing it twice with one revolution of the rotor.

I believe I am suppose to line up the bb with the timing mark in the window and set the rotor to number one position aren't I. Is there another mark I am suppose to do this with and not the bb? What am I doing wrong? I feel this thing is beating me up.

Thanks for any reply, especially any previous threads that will help me start this beast.

Mitch

 

[Poser]

Only one bb; 7 degrees before top dead center.

Only one line; top dead center.


Make sure you are on TDC of the compression stroke and stick the distributor home, making sure to engage the oil pump.


Is everything else wired up properly? Do you have spark? Even if you are not timed properly, you should have spark. Have you verified this?

 

[1977FJResto]

There is only one BB on the flywheel. I just installed mine over the weekend and there is only one. There is a chance to are 180 degrees out on your timing. If you did a distributer install and now it wont start, I bet thats why. You have to be sure you are on the top of the compression stroke and TDC then reinstall your disrtibuter.

 

[Gusb]

A few BB notes...
https://forum.ih8mud.com/40-55-series-tech/232126-first-valve-adjustment-my-78-fj40.html

 

[badass]

IH8MUD Forums - View Single Post - Installing the dizzy after cleanup/removal HELP!!

That should work and if that doesn't then CruiserDrew's method should

Here are the steps I go through:

1) Set to compression stroke TDC-If there is pressure on either of the valves, you are 360 out. It takes a full rotation to get to TDC. Remember the compression stroke is every 2 revolutions of the crank.

2) Look down the distributor hole and line up the oil pump drive slot with the #5 spark plug. A screw driver works well for this.

3) Hold the distributor body with the vacuum pot in it's normal orientation, and point the rotor at #4 spark plug.

4)Insert the assembly into the hole. As the distributor gear engages the gear on the cam, the rotor will rotate as it slides in, and finish pointing at the #5 spark plug. Make sure it is seated all the way down.

5) Set timing visually-line up the pick up with the protrusion on the shaft.

6) Unhook the power wire to the coil (thick black with yellow stripe I think) and then crank the motor with the starter until you get a hint of oil pressure on the gauge. This can take a bit if the oil filter is empty. This way I'm certain the oil pump is engaged before the motor starts.

7) Hook up the power wire and attempt to start. Once it starts, check again that you have oil pressure, if no or questionable, shut it off immediately and go through the steps again. If you do have oil pressure, set the timing with a light.

Good luck, but this is not a place that you can make a mistake and get away with it, so be certain of what you are doing.

 

[mwsaling]

Great info thanks much, I am learning. I would have never got this on my own, I will buy a 77 manual soon - it probably has stuff like this. Is TDC found when you take the spark plug out of #1 position and when it blows your finger out then that is TDC. I will do a search for that, also what is the vacuum pot. Thanks so much. I will try this tonight. I do have spark, everything else seems to be in proper order.

Mitch

 

[Mr. Toad]

IH8MUD Forums - View Single Post - Installing the dizzy after cleanup/removal HELP!!

That should work and if that doesn't then CruiserDrew's method should

Here are the steps I go through:

1) Set to compression stroke TDC-If there is pressure on either of the valves, you are 360 out. It takes a full rotation to get to TDC. Remember the compression stroke is every 2 revolutions of the crank.

2) Look down the distributor hole and line up the oil pump drive slot with the #5 spark plug. A screw driver works well for this.

3) Hold the distributor body with the vacuum pot in it's normal orientation, and point the rotor at #4 spark plug.

4)Insert the assembly into the hole. As the distributor gear engages the gear on the cam, the rotor will rotate as it slides in, and finish pointing at the #5 spark plug. Make sure it is seated all the way down.

5) Set timing visually-line up the pick up with the protrusion on the shaft.

6) Unhook the power wire to the coil (thick black with yellow stripe I think) and then crank the motor with the starter until you get a hint of oil pressure on the gauge. This can take a bit if the oil filter is empty. This way I'm certain the oil pump is engaged before the motor starts.

7) Hook up the power wire and attempt to start. Once it starts, check again that you have oil pressure, if no or questionable, shut it off immediately and go through the steps again. If you do have oil pressure, set the timing with a light.

Good luck, but this is not a place that you can make a mistake and get away with it, so be certain of what you are doing.

So did you ever actually set the timing on your engine?

mwsaling: the BB comes around TWICE for each revolution of the distributor's rotor. It's possible that the distributor is set to send spark on the off-stroke.

badass is correct about the importance of engaging the oil filter.

 

[Colorado Boy-74-FJ40]

Sure sounds like 180º off

 

[Poser]

badass is correct about the importance of engaging the oil PUMP.

Fixed...

 

[IDave]

Fixed...

I liked "filter" better.

 

[bsmith123]

TDC

in cruiser drews post he doesnt say which cylinder he is checking for TDC

But later he says the rotor is pointing towards no. 5 when the dizzy is seated so I assume it is no. 5 he initially checks for TDC?

just to avoid confusion

 

[Mr. Toad]

What? You guys don't engage your oil filters? Thanks Poser.

bsmith123: It would be unusual to measure TDC for Cylinder #5. If you did, neither the timing BB nor the TDC line on the flywheel would be in the timing window. badass was referring to where the rotor should be pointing (in relation to the engine itself) when installing the distributor into the block and oil pump. When doing this, the engine should be set to TDC for Cylinder #1. Refer to the FSM pages linked in this thread.

 

[bsmith123]

gotcha

ah I see----- pointing towards the no 5 cylinder on the engine but actually positioned correctly to fire no 1 on the distributor

makes sense to me now

thanks


I suppose if you set it to fire on any cyl at tdc it should be ok as long as you are on the compression stroke and the rotor points to the right place on the dizzy though I would use the no 1 and the bb