Engine Undertray

Engine undertrays were probably only fitted to some diesels in order to increase their working temperatures.

this shows an old, broken undertray alongside a new Peugeot one

Looking up under front of car .  .  .  . 

.  .  .  .  this is quite likely how yours looks .  .  .  .

.  .  .  .  no undertray

This is the new fixing sold on ebay.  I couldn't get them to fit tightly in the square hole and they often dropped out if I didn't line the undertray up accurately.  The original Peugeot fixing was much superior, though tended to rust out.

so Plan B was to use these M6 Á M8 threaded rivet nut inserts (aka rivnuts)

I had to use mostly M8 ones which is rather overkill, but they fitted the holes well!

steel ones were very tough to fit, but then I got some aluminium ones which squished well into the square holes.

The new undertray was initially secured by these three original Peugeot clips at the front .  .  .  .  .  .  . 

.  .  .  .  .  .  .  and eight M8 socket-cap bolts.

.  .  .  .  .  .  .  and at the rear is located by the cross-brace

The new undertray was initially secured by the three original Peugeot clips at the front and eight M8 socket-cap bolts.

These clips have been replaced by M8 button-head bolts   .  .  .  . 

and the underneath is now protected from stray stones and the electrics from water splashes

The new undertray was initially secured by M8 Allen bolts (1) plus springs and flat washers. 

The button-head screws (2) looked tidier but also needed washers.

Finally, M8 and M6 flanged socket button head bolts (3) not needing washers made a neater finish