Exhaust manifold torque values

66 Caprice · Aug 12, 2014

The exhaust manifold on my "60" is leaking a bit. Appears to be a new gasket and all new bolts. I have had the Tractor for 4 months. Noticed the leak after painting. How tight can they be pulled down without breaking something?I have a torque wrench. Comments appreciated--

ET · Aug 12, 2014

I go to 55ft lbs. If that was ran with a blown gasket for a long time you may need to get the gasket surface on the head planed.

gtx1967jewison · Aug 13, 2014

55?! Sounds WAYY too tight. If it don't seal @ 30 get the surfaces planed

ET · Aug 14, 2014

7/16" grade 5 hardware JD torque spec is 55ft lbs. I never seez the bolts and work from the center to the outside. I usually do it in 2 stages. I retorque when the engine is at operating tempature.

buickanddeere · Aug 14, 2014

I don"t want to be the bearer of bad news but...... Bubba that sold you the tractor tried a quick fix after what they found . The high temperature gasket goop has now burned out and allowed the leak to re-appear.
The 60 manifolds are noted for cracking at the heat exchanger . And the contact surface of the exhaust manifold and cylinder head will be rotten and eroded .
The fix is to remove the cylinder head and machine the intake/exhaust flange surface flat and true. Odds are a new manifold will be a more satisfactory repair than tinkering with the old manifold.
When the head is off , which isn"t a huge job. You can check the bores for wear . then look for cracks around the top of the bores and across the sealing face.
A valve job with a three angle valve job never hurt anything either. The pullers take a cutter and mill the intake eyebrows down to the same level as the exhaust seat.
Anything interesting about the 60 such as lots of options, standard chassis etc?

Exhaust manifold torque values

66 Caprice

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ET

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gtx1967jewison

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ET

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buickanddeere

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