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Nov 19, 2017 21:19:00 GMT
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Eh, hello.
Well, I didn't drive to Roadkill today because yesterday when driving my car to see if I'd finally crushed the pressurised coolant escape committee (I haven't, not quite) I also became aware that I have some mild vapour ghosting out of my oil filler cap when running at temperature. At this point it isn't like a thick plume or column, but it is a fairly constant wisp of white and it smells acrid like hot oil. It may just be that the air has taken a distinct turn for the refrigerated down here on the coast at the moment and that's made it more visible than before, or it may be some inevitable by-product of an ageing engine and nothing too much to worry about. Or it might be the start of something that is growing as a problem. I need to look into it and yes, do the usual wet&dry compression test etc etc.
So for now though I'm pondering something I've been pondering on and off since first getting an Essex V6 about 18 months ago. Where is the PCV or any other pressure release situated on this engine?
The oil filler cap is vented... a standard Ford rubber push-in bung with a mesh piece inside and some escape channels under the lip. But... should this thing have a crank case pressure relief valve?Or at least shouldn't the other bank have some pressure relief out of the rocker cover?
So I'm wondering if there's an Essex-head out there who can enlighten me as to where the pressure gets relieved, and where, very specifically, I might start looking for a PCV so I can replace it!
Cheers and thanks and everything.
T
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ChasR
RR Helper
motivation
Posts: 10,309
Club RR Member Number: 170
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AFAIK the PCV on Essex engined cars goes into the vacuum port on the carb.
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Nov 20, 2017 10:03:58 GMT
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Indeed. I know where it should get fed into... on mine it doesn't. I'm hoping to find out where I can actually find the actual pressure relief item though. Without being able to trace back from the carb... and to be honest without actually taking the time to look properly just yet... I'm wondering where it might located on the engine (I mean anything that isn't simply a release mechanism on the rocker covers). It's a bloody tight space in the SE5a for mooching about looking for things so I'm hoping somebody might say [eg] "There's a crank case breather on the driver's side at the bottom of the engine block, near the back" or "Just above the intake manifold near the front, passenger side" etc.
Been googling it and I can't find anything that says "The Ford Essex has a crank case breather/PCV/pressure release gizmo screwed into the Dingleberry just above the Howso Accumulator".
It seems to only be venting on one rocker cover. I can't quite figure out how venting one rocker cover helps both sides of the engine. Maybe I'm being dumb as usual.
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Last Edit: Nov 20, 2017 12:20:05 GMT by Deleted
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ChasR
RR Helper
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Posts: 10,309
Club RR Member Number: 170
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Nov 20, 2017 15:19:06 GMT
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I think the PCV plugs into the rocker cover with a grommet and then into the carb. Burton power sell the PCV and hose. I'd get the hose from Silicon Hoses.com  . If the hole is in one side of the rocker the cap may live on the other side. Normally there will be a vent channel of sorts on the heads to help with this. I know my M3 has this and the Stag "sort of" did. Ventillation systems weren't all that back then but they did at least help with preventing oil leaks. My Stag had the vent outlet and the cap both on the same side. |
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Last Edit: Nov 20, 2017 15:22:30 GMT by ChasR
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Nov 20, 2017 15:44:34 GMT
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That's what vexes me a little. One rocker cover has a vented oil filler cap (out of which I now have vapours seeping when running) and the other rocker cover has nothing at all. But the two aren't connected in anyway that would mean the right hand rocker cover with the vented cap can relieve pressure from the left hand bank where the rocker cover is a solid unit with no pressure venting at all.
I'm really confused about this aspect of the Essex.
I've checked out the PCV and grommit that I can buy from Burton. For me it's a case of wondering if there is a pressure relief port engineered into the block, or somewhere on the inlet manifold maybe, where a PCV might already be screwed in, but getting blocked up and sticky and in need of replacing.
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Nov 20, 2017 18:28:39 GMT
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Hi, When the Essex was in production the use of PCV was in its infancy. They only had the gauze in the oil filler cap at first and only later went over to actually sucking the fumes out sometimes into the air filter housing and being sucked in through the carb and later still into the inlet manifold. The rocker cover spaces are connected together through the crankcase by the pushrod holes and oil drainback passages. I suspect you are over thinking this and applying modern thinking to an older technology. If you're that worried about it then fit a later rocker cover or drill a hole in your one and fit a PCV like ChasR describes and route it into the air filter or the carb if it has the port for it.
Colin
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Nov 20, 2017 18:36:21 GMT
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Nice one, cheers Colin. That's exactly what I was looking for... ie "it doesn't exist" which explains why I've never found it. = )
Also... good to know both rocker covers are actually served by the single side vented oil cap.
Now my question is "how much vapour is too much vapour?" but I'm going to leave that for another day's exploration time.
Thank you!
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Last Edit: Nov 20, 2017 18:37:50 GMT by Deleted
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ChasR
RR Helper
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Posts: 10,309
Club RR Member Number: 170
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Nov 20, 2017 20:14:13 GMT
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Ah, I misread it. I thought you had an existing hole in one of the rocker covers other than the filler hole
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Last Edit: Nov 21, 2017 7:24:51 GMT by ChasR
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Nov 25, 2017 13:53:20 GMT
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The Essex has a PCV in the RH rocker cover which feeds into the spacer below the carb. If you don’t have one, it’s been modified.  |
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Last Edit: Nov 25, 2017 14:01:17 GMT by scimjim
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Nov 25, 2017 18:08:19 GMT
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Jim, it looks to me like you've got one on your left hand rocker cover to me... in terms of the viewer's perspective.
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Nov 25, 2017 19:04:01 GMT
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These are the rocker covers that came with my engine. No breathers on either cover... only the vented oil cap on the right hand side. Don't get distracted by any things you can spot wrong in the engine bay. This is an old shot from the day I bought the car and I've changed a lot since then.  I wonder whether I should fit a PCV in each rocker cover. |
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Jim, it looks to me like you've got one on your left hand rocker cover to me... in terms of the viewer's perspective. Yep - the RH rocker cover....in relation to the steering wheel. You have aftermarket rocker covers that haven’t been drilled for the PCV - where does the pipe from the carb spacer go? |
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Nov 26, 2017 10:46:03 GMT
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Ah right, gotcha. Yes they are indeed aftermarket rocker covers.
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