Tuesday, May 8, 2012

Pressures on - Compression testing

Hi All,

After the ride of shame it was time to try and sort the problem
The  traditional order is valves, compression, points (dwell), timing, then carbs.

Valves were for once nice and I believe that there is a new head like the DPO said.

Compression, sadly a mixed result.
- Firstly dry
No.1, 117 psi, Okay, not great but see what the rest are like.
No. 2, 121 psi, hmm.
No.3,  115 psi, still hmm.
No. 4, 150 psi ! definitely not a good sign.

- Then wet, with a squit of oil.
No.1 = 120 psi, still not great but means rings are not to bad.
No.2 = 138 psi, damn quite a rise so rings not good here.
No. 3 = 137 psi, same as No.2.
No.4 = 170 psi another high one.  It’s one thing being low at around the 120’s any significant difference between cylinders is also not good.

I suspect / know a rebuild is now in the near future. However, she should run okay for a while.

While the plugs were out time for a quick play with my new toy a bore scope !

All seems okay on the liners with honing marks still visible. Suspect she may be a bit loose as the the last rebuild might have just been honed and not bored oversize.

No. 1 Liner

No. 1 Crown
No.2 Liner

No. 2 Crown

No.3 Liner

No.3 Crown

No.4 Liner

No. 4 Crown

No.4 Valves (not a good picture).

So problem not fixed and a one coming in a while.

Richard B.

Next . . . . . . Points and distributor.

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