Bob,
Used TR4 side draft tubes are probably pretty cheap as they don't really
break and are pretty simple. (just saw one one eBay with no takers a couple
weeks ago) I think I would opt to pop a hole in that 'side-plug' and yank it
out and re-install a TR4 side tube.
Air should go IN the filler cap (oiled guaze) and OUT the side draft tube
(baffled but open pipe end). The 'under-draft' below the car helps pull the
'bad' air from the side tube under and out the back of the car. When you get
serious piston ring 'blow by' you get the benefit of rust proofing the
underside of frame with fine oil mist.
Carl
'63 TR4 since '74
ps; the valve cover with top brass bolt is TR4 rather than TR4-A
In a message dated 4/25/01 21:52:34, owner-triumphs@autox.team.net writes:
>Subject: Crankcase ventilation question
>
>Hi All.
>My 3A has a 4A block, which does not have the conventional road
>draft tube for simple ( if environmentally devious) disposal of ' crankcase
>breath '. The car has a 4A valve cover, which has a medium sized brass
>plug approximately in the center/top surface. In addition, the oil filler
>cap is the ' vent to air ' style, and as a result it seems that my only
>remaining path for crankcase ventilation is this mesh-filled cap. After
>a fairly short time, I see a film of crankcase distillate building up around
>the cap, and also suspect that this is responsible for the occasional
>whiff of 'eau d' blow-by' which overpowers my little green scented tree.
> The original road tube is completely missing, and in its place is a
>very well seated plug, ( looks like a mini-freeze-out) which would be a
>royal PITA to remove. Should I remove the brass plug on the valve cover
>and make up a top-fitted road draft tube, and change the filler cap to a
>non-vented model? I do not consider the blow-by issue to be serious enough
>to warrant engine tear-down, but I would like to reduce the present level
>of external engine lubrication.
>Your thoughts?
> Bob Westerdale
> 59 3A TS36967
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