OK thanks.
I'm not sure if you have a vented Oil Filler Cap, these are a bit taller than the sealed ones and you can ID them by the vent slots around them and the filter inside them.
It does look like the Carb does have a CCV port, however, there's a hose connected to it going under the car somewhere ???
Also, most of those types of rocker covers, the 'vent' on them is fitted with a one way valve which will only let Air IN. They do not normally breath out through them at all.
The way that's plumbed it won't breath which is what you're finding.
I'd suggest starting off with fitting a Timing cover that has a breather as that can be done with the engine in. You'll have to look for a fair bit those as your engine won't have the timing chain tensioner and the matching backing [late, so it's not a straight forward swap. There were some older non-tensioner type timing covers though that do have breathers - or you can fit on to the cover you have. This may also mean fiddling with Fan spacers too to get clearance from the fan.
Connect that breather (via the Oil Separator) to the CCV Port on the Carb.
There are some after market breathers that can go on in place of the mechanical fuel pump, but these alone won't do the job and they also don't have an Oil Separator, so the car will be very smokey.
Plug up the breather on the rocker cover and fit a Vented type Cap.
You may find though if the rings aren't sealing as well as they should that you need an additional breather in which case, I'd suggest swapping out the transfer case for one that will take a breather.
No easy simple fix I'm afraid.
<EDIT: The rings need a high pressure differential across them to bed in and seal. Poor Crankcase Ventilation can reduce the pressure differential to the point where they may not seal or have bedded in (and glazed the bore). Sort the ventilation, give it some stick for a bit before deciding if the bores are now glazed. You might be lucky.>
Edited by Moke Spider, 13 April 2017 - 11:51 PM.
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