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What's the best way to slowly turn an engine over by hand in a 6.5L n/a hummer? I know I can "find" a way to do it but I'm sure there is a best practice where I won't strip or break something in the process.
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Hand barring engine in M1097R1?
- Thread starter LCA078
- Start date
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- 564
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- Location
- Cleveland,TN
Pull the glow plugs and put a big wrench on the "lugs" on the back side of the dampener on the front of the crank. "Should" turn pretty easy. My 2 cents.
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- Austin, TX
That sounds pretty straight forward- thanks.
Okay, follow up question knowing that I don't have my HMMWV near me at the moment: Are there any marks/lines/dots/etc. on the crank pulley or harmonic balancer that I can use to tell which cylinder is TDC? Or is it easy to tell by looking/probing down the GP hole when a cylinder is TDC?
Okay, follow up question knowing that I don't have my HMMWV near me at the moment: Are there any marks/lines/dots/etc. on the crank pulley or harmonic balancer that I can use to tell which cylinder is TDC? Or is it easy to tell by looking/probing down the GP hole when a cylinder is TDC?
- 7,363
- 10,332
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- Papalote, TX
Yes, there are timing marks on the harmonic balancer, the pointer is on the drivers side below the PS pump.
It is always a good idea to bar an engine over in its normal direction which is clockwise standing in front of the truck looking at the harmonic balancer
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So a quick follow up as I was finally able to spend time on my 1097R1 this long weekend. I pulled the glow plugs after a few curse words as the one on the front left of the engine ( #1 cylinder , right?) was a bit swollen and required some vice grips and prying. As least I had a lot of work room on this glow plug because if it was anyone on the right side I probably would have been in a bad spot. I'll probably just buy new set to be on the safe side but that's another story.
As for hand turning the engine, I quickly realized we might be talking about different setups. I have the 4 v-belt set up and there is no way to grab anything on the damper or pulley.
I assume the lugs you're referring to are on a serpentine belt set-up? I found this pic on GP website for 1097A2.
So, with a v-belt set up, I assume the only way to easily hand bar the engine is either a socket on the cranky pulley or maybe even a socket on the alternator pulley. I ran out of time to try after futzing with the swollen gp so still need to figure out how to easily bar the engine.
Thoughts?
- 359
- 564
- 93
- Location
- Cleveland,TN
Yup, serpentine belt. Big socket time, should turn pretty easy.
- 220
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- Austin, TX
WILCO. I'll go slow.