[C320-list] Deck filler O-rings

[John Morrison]

Take the O rings to a hydraulic shop/pump shop they’ll be able to get you the correct size. I just did mine and the local hydraulic shop had ‘em. 
JohnM 
1999#574

Sent from my iPhone

> On Sep 1, 2020, at 5:16 AM, Dennis Cookson <dennis at cooksons.net> wrote:
> 
> I need to replace the o-rings in all my deck filler caps, and I can see that many owners have done this, but I can’t see any info on the size/spec of the replacement ring.  Does anyone know the exact spec, especially for the ring fitted to the diesel filler cap on a 1999 vintage 320?   I measured the outer diameter of the filler cap threads at about 41.3mm (1.625”) so presumably the o-ring inner diameter needs to be a little smaller for a snug fit, perhaps 1.6” or even 1.5”?  The cross section diameter appears to be 1/8”.
> 
> Are the diesel and water filler caps sizes identical?
> 
> Dennis Cookson
> #577