Shim Under Valve Spring Seat

[RSOHC]

I have found a 7/8 inch socket that is 1.25 inches tall and can be drilled out so that my valve spring retainer can fit on the top of the socket. I have a collection of drills that can be used as gauges as suggested by Neil Harvey.

[boyt911sc]

Have you tried valve spring height gauge P-10C? This is a factory OEM tool you will find recommended in the PSM (Porsche Shop Manual).

Tony

[Neil Harvey]

When I suggest the "bush" solution, it should be taken as a last resort. If you can buy the proper acceptable tool, do so.

[RSOHC]

I have ordered the Baum Tools P10C Porsche valve spring height gauge from Tillman Tools in Fontana, CA. The cost is $75.55 plus shipping. Thanks to Tony and all the others with suggestions.

[RSOHC]

I have received the P10C valve spring height tool.
There is only one line on the inner portion of the tool.
There is only one line on the outer portion of the tool.
The height from top to bottom when the two lines are aligned appears to be approximately 36.5 mm (1.438 inches)
My new Genuine Porsche valve spring retainers do not fit into the top of the P10C tool.
My old Genuine Porsche valve spring retainers do fit into the top of the P10C tool.

The valve height shown in my "914/6 workshop manual" is 36 mm +/- 0.3 mm for both intake and exhaust for a 2.0 liter engine.

The valve spring heights in my "Porsche 1975 Models 911 911S Carrera 2.7 Turbo Technical specifications booklet" are as follow for a 2.7 liter 911S engine.
Intake is 35 mm +/- 0.3 mm
Exhaust is 35.5 mm +/- 0.3 mm

The engine in my car is a 1976 911S.

Any suggestions on how I should proceed are appreciated.

Lauran

[RSOHC]

I have ordered a Speedway Motors short valve spring checker which has a range of 1.400 inch to 1.800 inch.

Lauran

[boyt911sc]

Originally Posted by RSOHC

I have received the P10C valve spring height tool.
There is only one line on the inner portion of the tool.
There is only one line on the outer portion of the tool.
The height from top to bottom when the two lines are aligned appears to be approximately 36.5 mm (1.438 inches)
My new Genuine Porsche valve spring retainers do not fit into the top of the P10C tool.
My old genuine Porsche valve spring retainers do fit into the top of the P10C tool.

The valve height shown in my "914/6 workshop manual" is 36 mm +/- 0.3 mm for both intake and exhaust for a 2.0 liter engine.

The valve spring heights in my "Porsche 1975 Models 911 911S Carrera 2.7 Turbo Technical specifications booklet" are as follow for a 2.7 liter 911S engine.
Intake is 35 mm +/- 0.3 mm
Exhaust is 35.5 mm +/- 0.3 mm

The engine in my car is a 1976 911S.

Any suggestions on how I should proceed are appreciated.

Lauran

Lauran,

Could you post a close up picture of the P-10C? Thanks.

Tony

[RSOHC]

Three photos attached.

[dannobee]

Set it to the correct height in a vise, paint it in the window with white paint, then scribe the lines in the right spot.

It's pretty tight in there with the engine in the car. You might need a mirror or bore scope tool to see the marks.

[boyt911sc]

Originally Posted by RSOHC

Three photos attached.

Lauran,

This is the 30-year old P-10C that I have been using with two (2) markings (35.5 mm and 34.5 mm) for 3.0 liter SC and Carrera 3.2 motors. Take your time and do some practice using your new toy.





Tony

[RSOHC]

I have ordered a valve spring height tool for Porsche 911 off of ebay. The markings of the tool are in number of 0.5mm shjms with a graduation for 0.25mm shims. The cost was $90 plus shipping. I ordered the last one available at this time.

[Neil Harvey]

Been doing this since the early 90'sand we build a lot of Porsche custom engines both air and water engines. Never used that tool. But I do understand why some do.
Goes back to my previous post about shims required and spring height verses spring pressure.

On all our engines we use a spacer ring that is measured at a known length. We then use a dial indicator of sorts to measure the difference in the installed retainer height. We need this dimension in our spring software.

But if you have simple tools you can do this measuring the same way. I have attached some photos of our bench tool we use for the air cooled heads, another showing if you have the heads off the engine and using a bench vice and dial indicator, and the other showing how to measure on the engine. A good reason to do it this way on the engine is, you can see the dial and numbers outside of the engine.

[RSOHC]

I have ordered twelve of shim size 0.5mm and twelve of shim size 0.25mm.
The spec on my engine is 35mm +/- 0.3mm for intake and 35.5mm +/- 0.3mm for exhaust.
What other shim sizes do I need to get my engine in spec and where can I source the other shim sizes?

Lauran

[RSOHC]

Today I received two valve spring height tools. The first was ordered from Speedway Motors and is Proform tool number 66903. The second tool is made by Frank Burger.

[boyt911sc]

Originally Posted by RSOHC

The springs are stock. The engine is in the car.

Why don’t you take the motor out and do all the needed work with the motor installed on an engine stand? Even experienced people would never do it unless you are in a race competition that needs to get the car back on the track. Good luck.

Tony

[RSOHC]

The tool from Speedway Motors is Proform tool number 66903. This tool is advertised having the capability of measuring from 1.400 inches to 1.800 inches with a resolution of 0.001 inches. This tool can be used to measure a spring height as small as 1.284 inches if a caliper is used to measure the distance from the top of the tool to the bottom of the tool if the tool removed from its location on the engine. Here is a picture of the Speedway tool.

[RSOHC]

The following photos are related to the valve spring height tool offered by Frank Burger. This tool shows spring height in terms of number of 0.50 mm of 0.25 mm shims needed.

[RSOHC]

Here is another photo regarding the Frank Burger tool.

[boyt911sc]

Lauran,

How many tools do you need to measure the installed valve spring height? I lost track of the count. By the time you finished this project, you would probably have half a dozen gauges in your tool box.

Tony

[john walker's workshop]

Crikey! Like one shim would make any difference.