Info

92^

Measuring tools with installation length marked:

Intake Exhaust

Measuring tools with installation length marked:

Intake Exhaust

VALVE SPRINGS, '87 MODELS ONWARD

ENGINE TYPE M28. 41/42

Note:

Do not use Special Tool 9240 or 9240/1 to measure the installation length of valve springs as of model year '87. Checking and adjusting length of valve springs, see page 15 - 116 b.

15 - 116 Checking and Adjusting Installation Length of Valve Springs

85 models

40.00 mm

86/86 model

Valve spring

Free length Outer spring Wire dia. Outer spring Inner spring

3.Install valve and hold against valve seat. Once installed, the end of the valve stem should be between the end of the upper edge and the offset surface of the special tool. If the valve stem protrudes beyond the upper edge of the special tool, install shims to take up the excess. 0.5 mm thick shims are available.

4.Do not mix up the valves after adjustment.

Printed in Germany-XIII, 1986 Checking and Adjusting Installation 15 -

Length of Valve Springs

CHECKING AND ADJUSTING INSTALLATION LENGTH OF VALVE SPRINGS (32-VALVE ENGINES)

VALVE SPRINGS, '87 MODELS ONWARD ENGINE TYPE M 28. 41/42

Note:

It is essential to ensure that the 2.To facilitate installation correct valve springs are installed shorten secondary spring to in cars of the various model approx. 50 mm.

years.

Modell 85/86

Modell 85/86

TOOLS (IMPROVISED)

Valve spring plate SP No. 944.105.467.03

Secondary spring SP No. 928.107.171.01

Note:

When selecting the valve spring plate (improvised) it is essential to ensure that the valve spring plate is 2.0 + 0.2 mm thick.

.Install valve and press against valve seat. Install plate, valve spring retainer, secondary spring and spring plate with ground surface.

4.Install conical valve keepers with Special Tool 9242.

.Using a depth gage, measure from surface of valve spring plate vertically through gap to outer spring bearing surface.

1.Grind a face approx. 10 mm broad on valve spring plate. Install spring plate for measurement only.

15 - 116b Checking and Adjusting Installation XVI,1987 - Printed in Germany Length of Valve Springs

Installation length Intake 35.5+0.5 mm Exhaust 34.5+0.5 mm

6.Add or remove shims to correct installation length.

7.Do not mix up valves after measuring.

Printed in Germany - XIII, 1986 Checking and Adjusting Instal- 15 - 116

lation Length of Valve Springs

TOOLS - INSTALLING CYLINDER HEAD (32-VALVE ENGINE) TORQUING BY ANGLE OF ROTATION

No.

Description

Special tools

Remarks

Porsche Classic Models

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