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Collaudatore

Original Poster:

815 posts

88 months

[news] 
Wednesday 14th October 2009 quote quote all
frown

MK1 MX5 ownership not feeling so sweet now.
Noticed a little puff of something as I was driving yesterday and checked the oil today - almost at minimum. There doesn't appear to be anything leaking, nor was there anything leaking when it was almost full when I bought it.

Again.... frown

What could the problem be? Anything else I could check to help diagnose?

pbirkett

9,450 posts

158 months

[news] 
Wednesday 14th October 2009 quote quote all
CAS O-ring? Common fault, mine was leaking when i got mine. Cheap to repair.

Gizmo!

18,103 posts

95 months

[news] 
Wednesday 14th October 2009 quote quote all
pbirkett said:
CAS O-ring? Common fault, mine was leaking when i got mine. Cheap to repair.
Mine too. I thought I could smell something when it was warming up, turned out it was split. Very easy fix.

Collaudatore

Original Poster:

815 posts

88 months

[news] 
Wednesday 14th October 2009 quote quote all
Cheers guys. I'll go get my hammers and let you know how it goes.

5paul5

664 posts

57 months

[news] 
Thursday 14th January 2010 quote quote all
Think i have the same problem with mine, it smokes a bit on the overrun from the exhaust. Could it be the CAS O ring and where do i find it ?
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WarrenG

285 posts

83 months

[news] 
Thursday 14th January 2010 quote quote all
I babied out on the last week of snow driving, and noticed a nice plume of blue on startup, from stone-cold after a week's idle.

It doesn't do it on a startup on a morning cold, following a drive the previous day, but always after a few days not driven. is that related to the CAS O-ring (Crank Angle Sensor?) or is it just ring-pump on a cold, worn engine?

DennisTheMenace

15,580 posts

154 months

[news] 
Thursday 14th January 2010 quote quote all
5paul5 said:
Think i have the same problem with mine, it smokes a bit on the overrun from the exhaust. Could it be the CAS O ring and where do i find it ?
I would say its more likely to be valve stem seals or the rings on no.4 piston letting oil past .

MX-5 Lazza

7,236 posts

105 months

[news] 
Friday 15th January 2010 quote quote all
CAS O-ring failing causes an oil-leak that can trickle down onto the exhaust manifold so give a little under-bonnet smoke but usually just causes oil-drips on your driveway. It won't have anything to do with smoke from the exhaust.

Edited by MX-5 Lazza on Friday 15th January 08:37

dylan0451

1,036 posts

77 months

[news] 
Friday 15th January 2010 quote quote all
DennisTheMenace said:
the rings on no.4 piston letting oil past .
sorry, quick hijack...

is it that common for no.4 to start burning oil?

i was looking at the coolant re route kit FM do as part of my base upgrades before i consider more power, but wasn't sure it it was worthwhile

bluetone

2,040 posts

105 months

[news] 
Saturday 16th January 2010 quote quote all
MX-5 Lazza said:
CAS O-ring failing causes an oil-leak that can trickle down onto the exhaust manifold so give a little under-bonnet smoke but usually just causes oil-drips on your driveway. It won't have anything to do with smoke from the exhaust.
^^^ What Lazza said.

Don't tend to 'hear' (on fora) of many smoky exhausts tbh..
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