VH4D Timing question

Hi All,

Hopefully this is an easy one, I may have time Sunday to try and get the Wisconsin started but I have one question: when I hand turn the flywheel and place my thumb over cylinder #1 do I call it TDC when the pressure is at its most or when the flywheel fin with the X is at 12:00 oclock like the book says? when it's at 12 I only have about half the pressure on my thumb , does it matter where that X ends up ? should I just go with the max thumb pressure and call that TDC?
 
Scott
As I am not familiar with your engine this may or may not work..
Holding your thumb over the hole to determine max pressure as TDC is not the way to go !! Once you are sure you are on the compression stroke remove your thumb and slide a pencil down on top of the piston, it will rise and then fall back as the piston reaches and goes over TDC. You can then roll the flywheel back and forth to find TDC. This method works on most engines unless the plug hole is offset from the piston over the valves.
Jo
 
Sounds like a good idea, once I find TDC does it matter where the X is on the one fin? In the manual it says the X should be at 12 o'clock but it's not ? I didn't think that mattered just wanted to throw that out there to see what others thought?
 
TDC of #1 is when the "x" mark is in line with centerline of that cylinder. 45 degrees past center of the "V". You really ought to have a manual. Here is a link to one:

http://www.wisconsinmotors.com:8080/wm/images/catalogs/wisconsin/VH4D_Repair.pdf
Repair manual
 
Thanks , I do have a manual however the machine and engine combination is hybrid so some things match up and some things don't, seems everything I try to do lately doesn't match up. The manual says the fin mark on the shroud at TDC should be at 12 o'clock and its not , just trying to find out if that matters or not? I don't think it does TDC should though you gotta have that.
 
Scott
From what I see on the timing of the magneto as shown on pages 12 and 13 of the link provided by Tramway guy it appears that the X is in line with the center-line of the # 1 cylinder at TDC and then the X is advanced to the 12 O'clock position and the magneto is then set in with the timing mark on the magneto gear visible through the hole as shown in fig. 11 after having just fired the # 1 plug. Hopefully my explanation clears up some of your confusion.. or at least that is the way I read the instructions.
Jo
 
I understand what your saying and what the link shows its just not adding up for some reason. At this point I found TDC and the x on the outside fin edge is at 2 o'clock and when I crank the engine a little more it begins to go back down at the end of the stroke I think I'm around 5 o'clock? I just wonder if I'm worrying too much about that x ? Shouldn't it start if I find TDC and then find the mag x thru the sight plug and marry the two together? I have no clue
 
Perhaps when the engine was rebuilt something didn't go back like factory and maybe the center mark on the shroud housing doesn't apply anymore? Unless someone has any other ideas I'm going to find TDC on number one, time the mag, link the two together get my 1342 set, and try her out.
 
The more I think about this and the more I look at things, I bet what happened is when the machine shop tore everything down to rebuild the engine which was everything from the crank ,pistons rings, the whole 3000.00 treatment so chances are the fan had to move and I"m sure they never anchored it in place at center when they put everything back together so unless I"m wrong I need to find TDC and mark the new location on the shroud housing and that will be the new center line so to speak?
 
The marked fin is in line with #1 crankpin, no matter what else you have or think. TDC cannot be at the top of the shroud, since it is a "V" configuration. TDC is at 45 degrees away from the shroud top. Which way depends on which bank of cylinders you are working.
 
Scott
Have you checked to see if the flywheel key was ever installed ?
Remove the nut and washer holding the flywheel on and see where the key-way is on the crank shaft, it should be directly below the X as is fig#11. When you are TDC on #1 poiston all should line up at about 10:30, #1 piston is the front piston on the Left bank.
Jo
 
The flywheel woodruff key should directly on top when No1 piston is at TDC on the compression stroke. Hal
a128561.jpg
 
Hal
Sorry but I have to disagree with your statement. Page 14, left column, 2nd paragraph says piston TDC with X pointing to center line of cylinder, key directly under X as shown in Fig: 13. This is for installing a distributor. But to install a magneto continue to rotate X to top as shown in Fig:11 as you show. So the piston would no longer be at TDC and the mag must be timed as well by having fired it past the # 1 plug location and installed with gear mark visible. Scott's description leads me to believe that the key is missing and the flywheel is not in the correct position, I hope he checks that out before trying to install the mag. Again, I say I'm not that familiar with this engine. So, am I reading the book right or is it wrong in the book? I have found on more than one occasion that a book is wrong. PS: I'm wrong many times too, just ask SHMBO.. LOL..
Jo
 
Look at this picture I've posted down on the far right to about 4 o'clock. It has Keyway on Top. Rotate the rotor to about 1 0'clock and install the mag on the engine. Hal
a128569.jpg
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top