Thermostat o-ring

[Dragon]

Hi folks,
Working on 1.9 dg engine.
I am in the process of reconnecting the solid metal water pipe, which runs behind the pulleys and belt, into the thermostat housing.
When I try and ease the pipe and o-ring into the housing the o-ring inevitably slips out of the locating groove and slips further down the pipe! The o-ring came with a full gasket set so presuming I've got the right size. Done all the obvious things with vaseline, grease and trying to hold in place with jubilee clips!!
Has anyone got any tips on how to do this fiddly little job or is it just a matter of perseverance and patience? Mine is wearing thinner than the o-ring I'm working on!
Any thoughts or tips are much appreciated.
Cheers!

[billy739]

sounds like you have the early cooling system.

if im thinking of the same pipe the seal sits in a grove, a lip each side.
the seal should fit snug and if lightly grased will just slide correctly into the stat housimng (which im guessing is on the water pump)

make sure the hole in the casting is smooth and free from any corrosion or build up

[Dragon]

Sounds like you know the bit I'm speaking about. Yup, there is a groove on solid pipe. Will persevere and take some cleaner and wire wool to the surfaces and re-grease as you advise.
Appreciate your assistance.