Normal torque need to rotate the engine manually?

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Dumindu
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Normal torque need to rotate the engine manually?

Post by Dumindu » Sun Nov 10, 2019 7:44 am

My car is a 1987 Toyota Tercel DX Wagon RHD 1452cc 2bl manual driven car

In my car. what is the normal torque need to rotate the engine manually in neutral gear?

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NWMO
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Re: Normal torque need to rotate the engine manually?

Post by NWMO » Sun Nov 10, 2019 12:08 pm

Dumindu,

No help with numbers, but you should be able to spin the engine by hand in nuetral. It should spin pretty easy and you will feel the compression points. It will be more difficult and then get easy again.

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Yaut
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Re: Normal torque need to rotate the engine manually?

Post by Yaut » Sun Nov 10, 2019 9:11 pm

I concur with NWMO. You should be able to rotate the engine by hand and feel it get a little harder as the pistons come up on compression.
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Petros
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Re: Normal torque need to rotate the engine manually?

Post by Petros » Mon Nov 11, 2019 4:48 pm

if you remove the spark plugs, you should be able to spin it by hand no problem. I do that when I am adjusting the valves, I can grab the alternator pulley and fan belt with both my hands and move it to the next position with a little effort. or I can put a ratchet wrench on the front pulley nut and it moves very easy with one hand.

if you have a lot of resistance than there may be something wrong inside the engine. though usually you will get other symptoms when it is running with so much internal drag.
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Dumindu
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Re: Normal torque need to rotate the engine manually?

Post by Dumindu » Tue Nov 12, 2019 12:11 am

Thank you all very much for your valuable answers.

I have measured the torque needed to spin the engine.

I removed all the spark plugs. Car was in the neutral gear. I did put a 27cm long spanner to the nut of the crank pulley. I connected a spring scale to the other end of the spanner. I pulled the scale in a right angle. It was 10-11kg when pulley starts to spin.

Since 1kg equals 9.8N, 10kg equals 98N.

So the torque was 98N x 0.27m = 26.5Nm

26.5Nm equals 19.5 lbft

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Petros
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Re: Normal torque need to rotate the engine manually?

Post by Petros » Tue Nov 12, 2019 5:06 pm

sounds within reason. That does not sound like it has excessive drag.

next time I have my spark plugs out I want to try that, that is useful information to know.
'87 Tercel 4wd SR5 (current engine swap project)
'84 Tercel 4wd (daily driver, with on going mods)
'92 Mazda MPV 4wd (wife's daily driver)
'85 Tercel 4wd DLX auto(daughter's daily driver)
'01 Honda Civic (other daughter's daily driver)

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Dumindu
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Re: Normal torque need to rotate the engine manually?

Post by Dumindu » Wed Nov 13, 2019 5:07 am

Thank you Mr.Petros

If you can, please publish your data here.

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