Month: August 2020

Measuring a Valve Guide

How to Rebuild a 911 Cylinder Head. Lesson 4, Valve Guides

911 Valve Guides The valve guides in the Porsche 911 Cylinder heads are consumable. The guides will also experience a lot of wear. There is constant friction between the guide and valve stem and the valve-train geometry puts even more side pressure on the guide. Porsche has always used a bronze guide. The bronze has …

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Valve Spring in the head

How to Rebuild a 911 Cylinder Head. Lesson 3, Valve Springs

Air-Cooled 911 Valve Spring Valve springs control the valvetrain. It is valve spring pressure that forces the valves to stay in contact with the rocker arm. Without the proper spring pressure, the valvetrain becomes uncontrollable. Not enough pressure and you can get valve float when the valvetrain gear loses contact with the camshaft lobe. Too …

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Dirty intake and exhaust vales on the bench waiting to be cleaned

How to rebuild a 911 Cylinder Head. Lesson 2, Intake and Exhaust Valves

Intake and Exhaust Valves This is Lesson Two from an Eight part series. In Lesson One, we covered the cleaning and disassembly of the cylinder head. In this lesson, we are all about the intake and exhaust valves. When the valves first come out of the heads they are very crusty. There can be a …

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