What's the point - Points and Timing

Hi All,

Well continuing on trying to solve the problem, its time to do the distributor for points and timing.

Apparently the problem is here !

Hmm, a little TLC needed.

 This is her off.

a 25D 4

And the serial number in case needed later.

Not to bad but the DPO told me digital points had been fitted !
Hmm these definately aren't.
Gap was also way off.

Ahh but this is a problem the ground for the advance plate is not connected.

Mechanical advance all a bit crummy.

All in bits and time for the part washer.

Cleaning up nicely.

Testing the vacuum advance.

Zero

Under vacuum (it has moved, honest).

Points gapped and it looks better.

My way of marking the distributor cap. Simple and permenant.

All done.

Back on.

Setting the timing .

Then fire her up and . . . . . . . Run, race, stall, start, stall, splutter, start, not start.
Damn ! problem not solved, so on to the carbs next.

Cheers,

Richard B.

Next . . . . . . Carbs again, this time properly not a quick and dirty blast with carb cleaner.

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.

Cheers,

Richard B.

Next . . . . . . Points and distributor.

Ride of shame

HI All,

Well it had to happen one day, the ride of shame !

I think it’s something in the distributor, as stumbling came back then she stalled then wouldn’t fire.

I took the distributor cover off at the road side, nothing obvious, except it needs a good clean.
Oh and the “digital points” that the DPO told me he had installed were imaginary, still got breaker points fitted.

So more toys ordered;

A timing light, with digital settings and dwell reading.
Vacuum pump, to test the vacuum advance.
Carb balancer, to set them up properly this time.
 
Watch this space for more tinkering as soon as I'm back from work trips and a holiday in Auz.

Cheers,

Richard B.

Next . . . . . . . . Check / adjust valves, then service the distributor and do the timing, then balance the carbs. Keep your fingers crossed nothing more sinister lurking.