Finally we got a newsgroup. I own a ’80 CJ7 with a three body lift and
31×10.5×15 and an ’85 CJ7 stock except some rims. The ’80 rins smooth
but my ’85 is real rough. It blows condensation out of the breather and
I get an oil slick in my air filter housing. And no its not the PVC,
any ideas what could be causing my crankase to burp like this?? Also on
the ’85 I’ve got a T176 transmission that is really, really noisy. The
gear mesh must be off, but I’m wondering if anyone else has had that
problem? But enough of the problems. Anyone whos got any great ideas of
add-ons or tricks please feel free to post. And if anyone is near Raleigh, NC
lets go mud slingin’. Is there an Eastern 4WD club near here?? Soon
I’m going to try to post some gif of some bad ass Jeeps. For now Later.
—
Donovan N. Leonard
dnleo…@eos.ncsu.edu
–"All of our knowledge has its origins
in our perceptions."
–Leonardo da Vinci
In article <3it8ch$…@taco.cc.ncsu.edu>, dnleo…@eos.ncsu.edu (Donovan
Nicholas Leonard) wrote:
[snip]
> The ’80 rins smooth
> but my ’85 is real rough. It blows condensation out of the breather and
> I get an oil slick in my air filter housing. And no its not the PVC,
> any ideas what could be causing my crankase to burp like this??
[snip]
Check your cylinder compression. You might have some worn/bad rings
causing excessive blowby… that is, to much exaust gas blowing past the
pistons into the crankcase. I believe if that’s an AMC 258 then the
compression should be on the order of 140-150 psi, but you might want to
double check that.
Cheers!
Tom
In article <3it8ch$…@taco.cc.ncsu.edu>, dnleo…@eos.ncsu.edu (Donovan
- Hide quoted text — Show quoted text -
Nicholas Leonard) wrote:
> Finally we got a newsgroup. I own a ’80 CJ7 with a three body lift and
> 31×10.5×15 and an ’85 CJ7 stock except some rims. The ’80 rins smooth
> but my ’85 is real rough. It blows condensation out of the breather and
> I get an oil slick in my air filter housing. And no its not the PVC,
> any ideas what could be causing my crankase to burp like this?? Also on
> the ’85 I’ve got a T176 transmission that is really, really noisy. The
> gear mesh must be off, but I’m wondering if anyone else has had that
> problem? But enough of the problems. Anyone whos got any great ideas of
> add-ons or tricks please feel free to post. And if anyone is near
Raleigh, NC
> lets go mud slingin’. Is there an Eastern 4WD club near here?? Soon
> I’m going to try to post some gif of some bad ass Jeeps. For now Later.
> —
> Donovan N. Leonard
dnleo…@eos.ncsu.edu
> –"All of our knowledge has its origins
> in our perceptions."
> –Leonardo da Vinci
Donovan – try changing your gear oil in the transmission. I did in mine,
and it got noticeably smoother. Also, consider synthetic oil – it is
commonly used in watercooled VW gearboxes, and it makes a huge difference
in smoothness. I see no reason not to use it in your CJ. I am assuming
that you have a 258 I6 – if your problem is not in the PVC, you have a
strange problem, but I would think that it is unrelated to the poor
running you mention – It has been a while, but if I am not mistaken, there
is a windage plate of sorts covering the PVC hole – air/oil vapor can
still exit, but solids are supposed to fall back into the head. Maybe
that has shifted – did you change the leakage prone valve cover gasket
recently? Some oil residue on the filter is normal, but a "slick" is not
right! Rebuild your carburetor, too. They suck, and they are expensive
to replace. I have had sucess in improving the running condition of my
6cyl motors in the past – not perfect, but better. I am assuming that you
have changed all the filters and spark plugs, too – check your distributor
cap. They also suck. I seemed to go through a lot of those in my Jeeps –
take it off, and look at the terminals – if they are at all dirty, change
it. It can help. I had a 78 CJ5, and it had a Motorcraft brain box, for
lack of a better term. It was grey, and had 2 plugs coming outof it – it
normally made the car stall, but maybe…..
Also, make sure that you have no vacuum leaks. You can do this two ways,
one, by spraying starting fluid on the connections between the
hose/carb/whatever it connects to while it is running – the idle will
temporarily increase asthe more volatile fluid gets bunrned. Or, you can
simply replace all ofthe hoses. I prefer the first method, as it lets you
see where the leak is before you fix it.
For fun, there are a lot of things you can do – first, what are your
final drive ratios? For off road use, the lower the better. (bigger # =
lower ratio). Locate a set of 4.11s and put them in, although this will
increase your engine speeds on the highway. Take off your swaybars – CJs
handle like trash, no matter what, and swaybars limit wheel travel. Put a
roll cage in it. You’ll need it at some point. Get an AMC v8 – more
power. Fun fun fun fun. What do you want to do with the jeep? That’ll
give me an idea of what to do with it – email me with your desires – I was
into the cj thing for a while, and I might be ableto help. Email to
man…@colorado.edu – on a friend’s confuser who drives a bitchin 86 CJ 7
– his words in verbatim. Mannix
In article <tgimon-2702951737460…@m23201-mac.mitre.org> tgi…@mitre.org (Tom Gimon) writes:
In article <3it8ch$…@taco.cc.ncsu.edu>, dnleo…@eos.ncsu.edu (Donovan
Nicholas Leonard) wrote:
[snip]
> The ’80 rins smooth
> but my ’85 is real rough. It blows condensation out of the breather and
> I get an oil slick in my air filter housing. And no its not the PVC,
> any ideas what could be causing my crankase to burp like this??
[snip]
Check your cylinder compression. You might have some worn/bad rings
causing excessive blowby… that is, to much exaust gas blowing past the
pistons into the crankcase. I believe if that’s an AMC 258 then the
compression should be on the order of 140-150 psi, but you might want to
double check that.
Cheers!
Tom
Tom: The shop manual for my 82 CJ-7 (258 6 cyl) says that the
compression should be 120 – 150 psi. Mine is 120, on the low side, and
I also am getting oil-drenched air filters. I suspect it is either
rings, or something else:
Whoever rebuilt the head before I got the Jeep may not have replaced
or installed the valve stem oil deflectors. If that is the case, then
oil is leaking from the head directly into the cylinders through the
valve guides. I’m going to take the valve cover off this weekend and
see if the oil deflectors are there…
–Doug
—
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Douglas Roberts, TSA-DO/SA |
Los Alamos National Laboratory | All good work is done in defiance
d…@lanl.gov | of management. — Bob Woodward
(505)667-4569 |
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