Date: Sun, 9 Sep 2012 00:23:21 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Low compression, more test results
In-Reply-To: <CA+r=JhpmTC9HvLZGs2zjsHZAxApttM01upU44MGCqS2TJcxkuQ@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
"Lash" caps are caps placed between the valve stem and the rocker adjusting
screw. They are used for a number of reasons.
For hi lift rockers and-or high lift duration cams the cap being larger than
the stem allows for extra rocker angles/lift without going off the edge.
They can be used to correct rocker angle geometry.
They can cover worn valve stems.
They will usually stop valve rotation.
Back in the old beetle days "swivel feet" adjusting screws were also used to
reduce valve rotation.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Larry Alofs
Sent: Saturday, September 08, 2012 8:05 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Low compression, more test results
" and adding lash caps."
Can someone explain about lash caps?
Larry A.
On Sat, Sep 8, 2012 at 10:56 AM, Tom Carchrae <tom@carchrae.net> wrote:
> Hi Stuart,
>
> My van had low compression on one cylinder when I bought it earlier
> this year. I took it to a mechanic (here in Vancouver) and he was
> able to restore the compression on my engine by adjusting the valves
> and adding lash caps. This included adjusting one to 0 lash.
>
> I'm not convinced my engine is well just yet. I've had a series of
> coolant issues, possible minor head gasket leak, but not confirmed.
> Anyway, van runs quite well, although certainly not fast, it seems to
> have a reasonable amount of power. I did get overtaken by another
> vanagon going up a very steep mountain hill; after that I started to
> get engine envy/doubt again. :)
>
> The worst scare so far has been starting it after it sitting for a few
> weeks. Oh the horrid tapping! A quick Google said lifters are prone
> to draining if left sit, so I crossed my fingers and drove it for a
> while and now it sounds fine again.
>
> Tom
>
> On Fri, Sep 7, 2012 at 7:52 PM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:
>> Well, for those who have been following by email thread about making
>> the mistake of checking compression on my 140k mile original engine
>> (90-150-100-130) I’ve done some more tests.
>>
>>
>>
>> 1. Valves were zero lash or 1 turn in, no valve noise, timing dead
on
>>
>> 2. Manifold vacuum is 12” Hg with ±1” tick (should be steady 17-21)
>>
>> 3. No detectable vacuum leaks (propane test), all vacuum hoses new.
>>
>> 4. 22% leak down on #1, could hear leakage all three places, but
>> exhaust and intake were louder than the dipstick, with the exhaust
>> being the worst. (Should have used the decibel meter on my iPhone,
>> but I didn’t want to get it greasy ;-) ). Didn’t bother testing the
others after this result.
>>
>> 5. Does not burn oil (in 1000 miles at least) Plugs that came in
it
>> were clean.
>>
>> 6. PO installed reman AFM recently
>>
>> 7. Idles smooth (as any of them anyway), runs well, no coolant
leaks,
>> but has poor acceleration and poor gas mileage (~15 mpg highway).
>>
>>
>>
>> Looks like it’s got some leaking valves. No surprise this rig is worn
>> out, I assumed it was, but I could drive it home at least. I hope I
>> can get a few thousand more miles out of it so I can save some dough for
a conversion!
>>
>>
>>
>> Sometimes ignorance is bliss, but never for long. I waited until
>> after my planned summer trips to check the engine condition, so I was
>> blissfully ignorant on purpose. I’m still planning a couple of fall
>> trips nearby though. What the hell, I’ve got AAA premier.
>>
>>
>>
>> Stuart
>>
>> ’85 Westy, purchased in May
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