Bill -
1 and 4 don't sound too bad. I'm betting that you've blown the head
gasket around 2 and 3. You're going to pull the head anyway to assess
the situation, so I'd just pull the head and see what you find.
Chris Kotting
ckotting@iwaynet.net
William M. Gilroy wrote:
>
> My 77 Midget (1500 engine) has an oil leak down low
> by the dipstick. I thought it was the pan gasket.
> After I put in my new dizzy I found that I was leaking
> even more oil. I found that the oil is not coming from
> the pan gasket but from the dipstick hole. I checked
> the oil, it is full but not over full. The valve
> cover vent is not plugged. I still get the leak if I
> run the engine with the valve cover vent disconnected
> from the carb. at the valve cover. Now I figure that the
> problem is excessive crankcase pressure even though the
> the crankcase is vent is work. I then ran a compression
> test and these are the number I got:
>
> Cylinder 1: 135 psi dry / 155 psi with oil
> Cylinder 2: 40 psi dry / 60 psi with oil
> Cylinder 3: 75 psi dry / 90 psi with oil
> Cylinder 4: 135 psi dry / 170 psi with oil
>
> I ran my compression tests with all of the spark plugs in, and
> I squirted a couple shots of 20-40W engine oil into the cylinders
> for the tests with oil.
>
> Now I am wondering what are my options. I think they range
> from a complete rebuild to doing nothing. I would like something
> in the middle. First exactly what do these number tell me?
> Like cyl 4 is it just a set of bad rings and cyl 1 is a set of
> bad valves and maybe rings. What is the correct answer?
> What are good numbers for compression? What would I see on a
> newly re-built motor? Could I get away with just re-ringing the
> pistons and a valve job. I am trying to explore my options. I
> would like to avoid a full engine rebuild at this time.
> I can see where that would lead me to many other things (hotter cam,
> paint the car since the engine is out, weber, headers, etc.) and
> I currently don't want to do all of this stuff. Maybe down the
> road but not now if I can avoid it.
>
> Thanks in advance,
>
> Bill
> --
> Bill Gilroy
> 77 Midget
> E-mail: wmgilroy@lucent.com
> Telephone: 732-957-4775
> Fax: 732-957-4775
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