tired of looking tdc arrow!!!

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hotflash44
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tired of looking tdc arrow!!!

Post by hotflash44 » Mon Apr 03, 2017 1:18 pm

Okay Guys, been waiting for this day its the first valve adjustment on my 2016 gu, now the fly wheel has only one arrow is this t.d.c.? I have rotated the fly wheel several times and marked the straight arrow with paint went around looking for any other mark none. Just the one arrow no dots, no dashes just the arrow that points forward . There is the line on the case which is for lining the arrow . The fly wheel has these oblong cuts all around the wheel and a flat spot between the cuts, there is one area about 3 flat spots before the arrow that looks like a big welded area,don't see anything that looks like a tdc mark there. SORRY FOR THE CAPS JUST WANT TO KNOW IF THE ONE AND ONLY ARROW IS T.D.C SO I CAN ADJUST THE VALVES. Dont want to screw this up. thanks for your help
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Albuquralque
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Re: tired of looking tdc arrow!!!

Post by Albuquralque » Mon Apr 03, 2017 1:36 pm




Once you have your flywheel at this spot, you want to verify that both pushrods spin freely with your thumb and forefinger on the side that you are going to check torque and then adjust valves.
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hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Mon Apr 03, 2017 1:52 pm

thanks thats the video i was looking for. is that a crazy Russian program just to pi$$ of the Americans or what!
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Re: tired of looking tdc arrow!!!

Post by Albuquralque » Mon Apr 03, 2017 1:58 pm

hotflash44 wrote:thanks thats the video i was looking for. is that a crazy Russian program just to pi$$ of the Americans or what!
Could be..........there are a lot of EFI flywheels out there with no mark.......
"Put a little gravel in your travel"


Previous Urals Owned: 2004 Wolf, 2006 Tourist, 2006 Patrol (TOW), 2006 Patrol (TOM), 2014 Patrol

hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Mon Apr 03, 2017 3:56 pm

thanks Albuquralque, you saved the day that video was the only one i have ever seen on the efi t.d.c. mark. the newer models dont have a timing mark just the arrow. i had forgot that. one thing a newbie needs to remember is when you start with the left side and turn the crank to the tdc arrow that it might be for the other side,tell if push rods dont spin, then you have to rotate 360 deg for the left side. all good now valves were good just a small adjustment was needed.
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Re: tired of looking tdc arrow!!!

Post by Ironhand » Wed Apr 05, 2017 10:16 am

Do yourself a favor and mark that arrow with a paint pen or permanent marker for the next time.
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hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Wed Apr 05, 2017 10:46 am

i did thanks, with all the posts on the flywheel marks i was really glad this video was relocated for me and any other late model Ural driver out there.
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Lee Pape
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Re: tired of looking tdc arrow!!!

Post by Lee Pape » Tue Apr 11, 2017 10:43 am

It is a horizontally opposed engine there is only ONE TDC. One side of the engine is on the compression stroke and the other side is on the exhaust stroke. Thus one set of valves is closed (both push rods can spin) and one set of valves has the exhaust valve open. If in doubt learn to watch your valves instead of looking for you timing mark. Plus the timing mark was not always where it should be. With older Urals you learned to watch the valves when adjusting them. And back then we did the twirl method for setting the valves, but this method can no longer be used on the 750 OHV engines.
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hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Tue Apr 11, 2017 10:48 am

never understood why you cant use the twirl method on the 750,you would think that if the push rod spins that the valve is closed. so adjust away.
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Re: tired of looking tdc arrow!!!

Post by Abaxter593 » Tue Apr 11, 2017 11:02 am

hotflash44 wrote:thanks Albuquralque, you saved the day that video was the only one i have ever seen on the efi t.d.c. mark. the newer models dont have a timing mark just the arrow. i had forgot that. one thing a newbie needs to remember is when you start with the left side and turn the crank to the tdc arrow that it might be for the other side,tell if push rods dont spin, then you have to rotate 360 deg for the left side. all good now valves were good just a small adjustment was needed.

Just use the arrow?

hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Tue Apr 11, 2017 11:03 am

that's what i did and it worked perfect,thanks
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Lee Pape
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Re: tired of looking tdc arrow!!!

Post by Lee Pape » Tue Apr 11, 2017 11:14 am

hotflash44 wrote:never understood why you cant use the twirl method on the 750,you would think that if the push rod spins that the valve is closed. so adjust away.
The valves clearances on the 750 are looser then they were on the 650 engines. The twirl method does not work with the greater clearances. On the 650 engines we used to set them to 0.003" and the twirl method was close enough.
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hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Tue Apr 11, 2017 11:42 am

bare with me im having a senior moment, the way i think when the push rods are loose enough the spin freely the valves will be closed, why would the 650 valve be different than the 750. as i see it both engines have their valves completely closed, one set at .004 and the other .003. how does the push rods effect the 650 and not the 750 if all spin freely? Again some folks on ss think im arguing, and get all upset , im not just unclear on the issue.
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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Re: tired of looking tdc arrow!!!

Post by Abaxter593 » Tue Apr 11, 2017 11:51 am

hotflash44 wrote:bare with me im having a senior moment, the way i think when the push rods are loose enough the spin freely the valves will be closed, why would the 650 valve be different than the 750. as i see it both engines have their valves completely closed, one set at .004 and the other .003. how does the push rods effect the 650 and not the 750 if all spin freely? Again some folks on ss think im arguing, and get all upset , im not just unclear on the issue.

On my 750, they only spin freely when at tdc... ?

hotflash44
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Re: tired of looking tdc arrow!!!

Post by hotflash44 » Tue Apr 11, 2017 11:58 am

that's true any push rod pressure on the rocker will cause that, and might open the valve a little, and for sure your not going to get a feeler gauge in. tdc on my 2016 gu is when the arrow in the timing hole is centered with the case slot mark,one side then rotate 360 deg for the other side. my question was with both push rods spinning on a 650 or 750 then why cant the 650 be adjusted and the 750 can doesn't make sense to me, but lots of things don't make sense.
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

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