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Old 14 Jul 2007, 05:49 pm
Elle
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Default Rotating Engine Using Wheels?

91 Civic, manual transmission, here. I am doing a timing
belt replacement. The front of the car is on jackstands, and
I put the transmission in 5th gear. I freed the pulley bolt
just fine, but then I wanted to rotate the engine so #1
piston was at TDC blah blah. I thought turning either of the
front wheels by hand would, via the manual transmission,
also rotate the engine. But no luck. I put the pulley bolt
back in and rotated the engine to get #1 to TDC. As I turned
the crankshaft pulley (via a socket on the pulley bolt), the
front wheels turned roughly in synch with the pulley's
rotation just fine.

What might have prevented my turning the engine by manually
turning the front wheels?


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Old 14 Jul 2007, 06:16 pm
Michael Pardee
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Default Re: Rotating Engine Using Wheels?

"Elle" <honda.lioness@nospam.earthlink.net> wrote in message
news:Ipcmi.7645$Od7.784@newsread1.news.pas.earthli nk.net...
> 91 Civic, manual transmission, here. I am doing a timing belt replacement.
> The front of the car is on jackstands, and I put the transmission in 5th
> gear. I freed the pulley bolt just fine, but then I wanted to rotate the
> engine so #1 piston was at TDC blah blah. I thought turning either of the
> front wheels by hand would, via the manual transmission, also rotate the
> engine. But no luck. I put the pulley bolt back in and rotated the engine
> to get #1 to TDC. As I turned the crankshaft pulley (via a socket on the
> pulley bolt), the front wheels turned roughly in synch with the pulley's
> rotation just fine.
>
> What might have prevented my turning the engine by manually turning the
> front wheels?
>
>


Of course, if both front wheels are off the ground the far wheel simply
rotates the opposite way because of the differential.... Whenever I do that
I say "D'oh!" or something similar in effect!

Mike



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Old 14 Jul 2007, 06:31 pm
jim beam
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Default Re: Rotating Engine Using Wheels?

Elle wrote:
> 91 Civic, manual transmission, here. I am doing a timing
> belt replacement. The front of the car is on jackstands, and
> I put the transmission in 5th gear. I freed the pulley bolt
> just fine, but then I wanted to rotate the engine so #1
> piston was at TDC blah blah. I thought turning either of the
> front wheels by hand would, via the manual transmission,
> also rotate the engine. But no luck. I put the pulley bolt
> back in and rotated the engine to get #1 to TDC. As I turned
> the crankshaft pulley (via a socket on the pulley bolt), the
> front wheels turned roughly in synch with the pulley's
> rotation just fine.
>
> What might have prevented my turning the engine by manually
> turning the front wheels?
>
>

compression and gear ratio. and you need one wheel locked if you want
to do it by turning the other. should be easy enough in top gear.
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Old 14 Jul 2007, 10:41 pm
Elle
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Default Re: Rotating Engine Using Wheels?

"Michael Pardee" <michaeltnull@cybertrails.com> wrote
Elle
>> What might have prevented my turning the engine by
>> manually turning the front wheels?
>>
>>

>
> Of course, if both front wheels are off the ground the far
> wheel simply rotates the opposite way because of the
> differential.... Whenever I do that I say "D'oh!" or
> something similar in effect!


Yes indeed, "Doh" on me. Both wheels are indeed off the
ground. Thank you, Michael.


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