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i.thomson
United Kingdom
408 Posts |
 Posted - 17/10/2016 : 16:51:58
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Does anyone know the purpose of the hole on the block side of the ear trumpet oil filler?
Ian Thomson |
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Drolshagen
Germany
669 Posts |
Posted - 17/10/2016 : 18:42:13
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Hi Ian,
it is the crankcase vent for a J2 engine,
Carl
J2 4362
L2 2036 |
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Ron Grant
United Kingdom
160 Posts |
Posted - 18/10/2016 : 10:09:09
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Hi Ian
There should be a circular brass gauze fitted to this hole, that has normally gone missing over the years.
Ron Grant |
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Ian Bowers
United Kingdom
941 Posts |
Posted - 18/10/2016 : 10:14:07
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Stuff some panscrub material tightly down the tube to minimise the number of flies etc which want to die in the oil.
Ian Bowers
OD 6791
J3 3772 |
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i.thomson
United Kingdom
408 Posts |
Posted - 18/10/2016 : 10:33:12
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Thanks for the clarification. It just seemed a little too large for a vent so I assumed that something was attached there. I take your point about the gauze Ian. I assume that the proper filter is not available anywhere.
Ian |
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i.thomson
United Kingdom
408 Posts |
Posted - 21/10/2016 : 13:19:12
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I wonder if it is possible to get a copper washer which is a tight fit into the hole and solder a piece of gauze to it? It doesn't sound too difficult. Perhaps one of those crushable sump washers would do. What do other people do?
Ian |
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powerplus
United Kingdom
599 Posts |
Posted - 21/10/2016 : 19:04:31
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Occasionally these gauzes can be found at Autojumbles in ex -Army type stalls. The gauzes themselves resemble the brass/ copper vents which used to be fitted to the sides of old mattresses. Mattresses always have been a source of treasures!
Powerplus. |
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Centric
United Kingdom
140 Posts |
Posted - 21/10/2016 : 21:16:41
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You may find that new elbows do not have the hole as I did to my cost. While driving down through France this summer at 36 degrees C most of the oil was blown out through the breathers in the Rocker Cover. Needless to say I now have a hole with a gauze filter.
Be warned!
Alan |
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Simon Johnston
United Kingdom
6121 Posts |
Posted - 22/10/2016 : 15:07:12
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Any chance that someone could post a photo of one the filler necks with the gauze in place? Mine must be a new one as it doesn't have either the hole or the gauze.
Simon J
J3437 |
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tholden
United Kingdom
1638 Posts |
Posted - 22/10/2016 : 15:43:25
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Here are pics of an original. Never seen one without the vent hole.
S and V produced very nice copies of this part complete with the correct brass gauze filter. Very important for crank case breathing to have this vent.
TH |
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Simon Johnston
United Kingdom
6121 Posts |
Posted - 22/10/2016 : 18:11:52
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Well, well, mine was supplied and fitted by Baynton Jones when they built my engine and guess what, it doesn't have a vent hole. That might explain the oil escaping from the cam cover vents?
Simon J
J3437 |
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Drolshagen
Germany
669 Posts |
Posted - 22/10/2016 : 18:23:23
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Hi Simon,
the same picture,
Carl
J2 4362
L2 2036 |
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Simon Johnston
United Kingdom
6121 Posts |
Posted - 22/10/2016 : 18:24:49
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Thanks, chaps. Very interesting. You learn something every day!
Simon J
J3437 |
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DickMorbey
United Kingdom
3677 Posts |
Posted - 23/10/2016 : 09:30:09
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Speaking of gauze vents, some of the early Rotax or Lucas DK4A distributors had similar vents in the base casting
Dick Morbey
PA/PB 0743
Frieth, Oxon, UK |
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njnh
United Kingdom
404 Posts |
Posted - 24/10/2016 : 20:27:11
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This is an interesting topic. My filler has no vent hole and no casting numbers. Perhaps mine is one of a replacement batch - it must be at least 25 years old.
Nigel H |
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tholden
United Kingdom
1638 Posts |
Posted - 25/10/2016 : 00:17:11
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Nigel there was triple M spares supplier in Yeovil back in the 1970's who I seem to recall made repro ones of these. Maybe they were sold with out the vent hole.
TH |
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