11-04-2021, 09:02 PM
(This post was last modified: 12-04-2021, 04:01 AM by tobytronicstereophonic.)
Having worked on Peugeots & Citroens for 36+ years I have found:
A large number of XUD engines seem to have lost a lot of their valve clearance after a few 10s thousand miles, and a few have no perceptible clearance, but all seem to run just fine. In later years, working for myself, I used to correct these anomalies, but it seemed to make no difference to how an engine started or ran...
A more interesting thing I found was when I fitted a brand new cylinder head to one of these engines, using the old original valves/shims (warranty work) they always checked out with perfect valve clearances...
This in my opinion is a fantastic triumph of the PSA's engineering prowess. How a cast alloy component can be made so reproducibly accurate...
Just leave as is, is what I mean :-)
Just though of this to share: in the late 1980s, at a main dealership, I had six Citroen BX Diesel engines in bits at the same time...
I forgot which was which, and put a 17RD head gasket on a 19RD. The 17 having a smaller bore, made the bigger pistons 'kiss' the gasket's fire-ring. It ran fine, just made a click-click-click on idle...
A large number of XUD engines seem to have lost a lot of their valve clearance after a few 10s thousand miles, and a few have no perceptible clearance, but all seem to run just fine. In later years, working for myself, I used to correct these anomalies, but it seemed to make no difference to how an engine started or ran...
A more interesting thing I found was when I fitted a brand new cylinder head to one of these engines, using the old original valves/shims (warranty work) they always checked out with perfect valve clearances...
This in my opinion is a fantastic triumph of the PSA's engineering prowess. How a cast alloy component can be made so reproducibly accurate...
Just leave as is, is what I mean :-)
Just though of this to share: in the late 1980s, at a main dealership, I had six Citroen BX Diesel engines in bits at the same time...
I forgot which was which, and put a 17RD head gasket on a 19RD. The 17 having a smaller bore, made the bigger pistons 'kiss' the gasket's fire-ring. It ran fine, just made a click-click-click on idle...