Engine assembly issues?

R

rochey6957

New Member
#1
#1
Hello all predator gurus! I have begun modifying my non-hemi engine by removing the governor and installing an ARC flywheel. I removed all the govenor bits, and throttle linkage, put my flywheel on and reassembled the engine. I spun the engine now and then while assembling and it seemed to be a bit difficult to rotate as it was in the compression stroke. That seemed normal to me, though. However, after reassembling and trying to pull start it binds up pretty good every other tug or so. But when I pull the spark plug out it spins perfectly smoothly.

My assumption was that the exhaust pushrod was not positioned properly and not actually opening the exhaust valve in time. So I just took it all apart again played with the valves and push rods and again got everything to spin freely with out the spark plug. Put the plug back in and it binds up. I am baffeled!

I also took a video to help illustrate what is happening.

https://youtu.be/GZeD3EZefXo


https://youtu.be/GZeD3EZefXo



Sent from my SM-G900V using Tapatalk
 
ole4

ole4

#2
#2
exhaust valve adjustment is too loose. There are a lot of threads on this. if you do not do the adjustment slightly past TDC on the compression stroke you will be on the decompressor ramp when doing the adjustment.
 
T

tysonsk

New Member
#3
#3
Yep. I made the same mistake 2 weeks ago. It was my first engine build. You really need to have the valve lash set properly. I nearly ripped my hand out trying to pull start the engine. Once I had the lash set properly, all the problems went away.
 
R

rochey6957

New Member
#5
#5
Hmm OK ole... Just past TDC? I have stock springs in there now. What should it be set to? I set exhaust @ .003

I might just get stiffer springs anyway, I plan to run this around 7000 rpm. 22lb springs for the non hemi with stock internals?

Sent from my SM-G900V using Tapatalk
 
You must log in or register to reply here.
Top