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To-20 continental gas engine, rebuild questions........

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03-02-2011 05:17:54

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(1) What should the normal operating oil pressure be on a TO-20 Z-120A continental gas engine? (2) and I also need the Head bolt tightning sequence and torque specifications.
(3) What would be the best oil to use in a completely rebuilt engine? on 1st run? Thanks Hollis

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John (UK)

03-03-2011 09:15:43

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 Re: To-20 continental gas engine, rebuild questions........ in reply to Hollis, 03-02-2011 05:17:54  
Oil pressure between 20 and 30psi at 2000rpm (full throttle) and minimum of 15psi at idle speed.If oil pressure drop when the oil is warm or hot then look at the Oil Pump it is probably worn..John

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03-02-2011 06:51:42

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 Re: To-20 continental gas engine, rebuild questions........ in reply to Hollis, 03-02-2011 05:17:54  
Thanks Jeff, I really appreciate all your help. Hollis

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03-02-2011 05:40:02

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 Re: To-20 continental gas engine, rebuild questions........ in reply to Hollis, 03-02-2011 05:17:54  

1) Normal is around 25 psi.

2) See picture for order.
Snug down then following pattern torque to 60 in-lbs. The following sequence torque up to 75in-lbs in 5in-lb increments. i.e. 65 in-lbs. 70in-lb ending at 74in-lbs.

3) The manual calls for a 30wt oil above 50F. Since you rebuilt a good quality 10W-30 would be ideal from now on.


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Fred Martin

03-03-2011 12:34:55

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 Re: To-20 continental gas engine, rebuild questions........ in reply to Jeff-oh, 03-02-2011 05:40:02  
Hey Jeff, would you please go out in your shop and find that big hammer of yours and smack yourself in the head with it to wake up and then tell Hollis to torque his head nuts to 75 FOOT pounds? Your friends are the only ones who will tell you something like this cause your enemys won't come! ohfred

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