Just thought of something: How did you break-in the cam that failed (and
the new one, for that matter)?
On 4/27/2020 4:35 PM, Bob Spidell wrote:
> I think this is the kind of failure ZDDP is supposed to help prevent.Â
> I doubt Mobil 1 has a lot of ZDDP in it; it was basically 'outlawed'
> in all but 20W-50--since very few modern cars use that weight and even
> fewer have flat tappets--and I don't think I've even seen M1 in that
> weight.  It doesn't sound to me like you did anything wrong with your
> driving habits; just a bit of bad luck maybe. My last rebuild I got a
> DW 'gun-drilled' cam, which I hope helps prevent lobe wear.
>
> Decades ago, Mobile made a 'Mobile 1' for aircraft and it was an
> unmitigated disaster; it didn't scavenge the lead in 100LL and the
> lead gunked-up rings (esp. in 'big block' Continental engines). I
> heard a few unscrupulous aircraft owners got new engine rebuilds if
> they used it, even if they didn't have a problem (a rebuild on a big
> Continental can run $50K or more). In the piston aircraft community,
> it was gospel that you used multi-vis oil only in the winter, and
> straight 100W--equivalent to 50W motor oil--in the summer and because
> it supposedly left a thicker film of oil on the moving parts (most
> piston aircraft have hydraulic lifters).
>
> Bob
>
> On 4/27/2020 1:41 PM, Wayne Schultz wrote:
>> Hello everyone, I recently completed a rebuild of the engine in my
>> Healey 3000. At 48K miles i noticed metal during an oil change. I
>> dropped my oil pan and found even more metal and a silver ring in the
>> block that lined up with a cam lobe. I had been using Mobil 1 for
>> years and always had good oil pressure and a very quiet motor. I
>> pulled the motor and upon teardown I found one bad cam lobe and
>> several lifters that had mild pitting. I thought about how I used my
>> car and came to conclusion I, rather than the oil might be theÂ
>> reason for the cam failure. I drove my car every couple of weeks in
>> nice weather. This is just enough time for the oil to leave the cam
>> and lifters to drain into the pan. This meant the next time I started
>> the engine the cam and lifters might have been metal on metal. My
>> new lifters are short bucket lifters with a drain hole to
>> lubricate the cam lobes. Now using VR-1 20/50
>>
>>
>
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