Flaminia 2.5 spare engine

[Richard Fridd]

I am now beginning a mechanical assessment of my spare engine.
 Both cylinder heads removed today, one gummed stud demanding three hours careful coaxing to enable the liberation of one cylinder head.
 The opposite cylinder head was surprisingly easy to remove.
  Bores look very good, so sump removal next to draw out the pistons. Piston rings possible not so good.
 I would like to replace the head gaskets if anyone has a pair available for sale.

  Richard

[Richard Fridd]

Photos

[DavidG]

Well done!

Are you just using the weight of the engine to pull against the head or have you got the block tied down to something and pulling upwards with the straps?

[Richard Fridd]

The straps and their adjustment were only to keep the first head square to the block, as it was pivoting very slightly on the gummed stud. If it wasn't for the one gummed stud the head would have lifted off.
  The second head lifted as soon as the stud nuts were released by means of pressure from the valve train springs.
 Further disassembly today.
 

  Richard
  

[Richard Fridd]

Everything seems to be in very good condition. However the piston ring gaps are 2mm.
  A set of 80mm rings required.

  Richard

[Richard Fridd]

As work continues, can anyone here explain how the vibration damper works?

[willoroe]

Yes, it is a torsional or harmonic damper. There are two main parts, the first of which is the mass which is 18 in the parts drawing, it is like a small flywheel. The second is the energy dissipating element, which in this case is a small friction element 17. Now because it is Lancia and they thought they had unlimited resources they decided that the best thing to do this was to double everything, so there are two masses and two friction rings. The springs push apart the two masses so that they are held against the friction plates but not mechanically connected to them. So it is a bit like two little clutches. The crankshaft is connected to the mass only through the clutches and that damps out the harmonics.

I wondered if there was some way of checking if it was still working on my car, but I would be very reluctant to take it apart. I'm sure Mitka knows the saying about the kinds of people who take watches apart: watchmakers and fools.

Now I'm glad I studied this in Engineering College 40 years ago!

Willo

[Richard Fridd]

Many thanks for your reply Willo.
  If your engine is not vibrating would it be safe to say that your harmonic damper
  is working properly?
  The engine in this thread has always been very smooth during my ownership, but my other 2.5 not quite the same.
  Having wondered about other possible reasons for this, I could swap the harmonic dampers. Bearing in mind watchmakers and fools.

  Richard

[chriswgawne]

"I'm sure Mitka knows the saying about the kinds of people who take watches apart: watchmakers and fools."

Never heard this expression before today......and last week I tried ( & failed) to reassemble an old clock platform escapement using parts from 2 similar clocks!
Nothing like an old fool!
Chris

[Mikenoangelo]

Interestingly the vibration damper is very similar to that used from 1922 onwards on the 20hp Rolls Royce. Royce's version was adjustable, to be set to slip at a design level of torque level. I made a long lever to bolt to the damper with a spring balance on the end of lever to check the load at the slipping point - it was still at the right level after 90 years!

Mike

[Richard Fridd]

The damper looks very good inside. Stripped and cleaned the sump and modified the sump plug and oilfilter housing to accomodate locking wire.

  Richard

[Richard Fridd]

Rotating the crankshaft by hand, a tight spot was apparent. Camshaft? OK with the timing chain removed, and now both the crankshaft and camshaft move freely. A mystery. Progressing to the removal and checking of cam followers, the remains of a pop rivet revealed itself in the timing chest tube. The culprit of this mystery?
  I now need to withdraw the camshaft, which although the three retaining screws are removed is not quite ready to come out.

  Richard

[Richard Fridd]

A question regarding piston rings. Having asked several experts, I have received conflicting comments about which way to fit the second/ scraper rings. These particular rings have a step on the outside circumference and are not marked with a dot or other identification.

  Ideas welcome as usual

  Richard

[Richard Fridd]

2nd scraper piston ring steps face downwards I understand. Once the tight cam follower was freed, this enabled the camshaft to be withdrawn. The solitary follower was impeded by sediment.
 Camshaft and pistons now refitted.

   Richard

[lancianut666]

Loving this thread as I (hopefully ) will be doing all this lovely stuff over the winter.
Clarkey