Part of our beloved hobby is the restoration/ maintanance of your old motorcar. Just recently we have started a series of repair projects under the name "PreWarCar Workshop".
In this PreWarCar Workshop report we would like to show you the making of new inlet and exhaust valves for a 2 cylinder 1905 Peugeot Type 125. In this case, I've had 2 broken inlet valves last season (one was on the magnificent 100 miles of Amsterdam rally), and my repair job on the first one was not good enough to my liking so I've decided to really solve the problem, and for the pleasure of the viewers write this article about it.
From a previous project, I had a box of brand new inlet and exhaust valves laying around from a 2004-new Scania R500 V8 truck. Not only are the valves a very close match to the original Peugeot valves, I also figured that if they can pull 50 tons of GVW up the Alps, they can probably get me around as well.
Because the valve stems have a stepped diameter, I couldn't hold it close enough in the lathe chuck to machine it without chatter (these valves are glass hard). And since I don't have a circular grinder, I had to make a custom collet to hold these valves and it worked perfectly.
Summary of the proces:I cut the valve head to diameter and seat angle, cut the stem to exact length, reamed the guides for the new diameter, made new spring retainers for the original Scania clamps and then I hand ground the 4 new valves in their old seats.
Since I still wanted to have a spare set, just in case, I decided to also make 1 valve guide extra for the old set of valves and keep this with me in the car. The making of that part is included in the photo album.
After quite a long test drive, I am very happy to say that the car drives like new again!
For the machining report, please visit my photo album.
Work photos & text by Jos van Genugten