2CV exhaust cross box studs

The 2Cv’s exhaust cross box is hung off bolts that go into the gearbox casing.

2CV exhaust cross box bolt

This does the job of holding the cross box in place – as well as the brake “cooling” ducts – but it is somewhat awkward to assemble everything together. As with the fuel pump and engine breather, the SPOG make a set of studs to replace the bolts to make assembly of parts easier. Fitting is “simply” a case of removing the old bolts and screwing in the new studs. The catch being access, even with the wings removed it’s hard to get to this area – especially to fit the studs – with the exhaust still in place.

Access to the 2CV exhaust cross box studs

With patience, perseverance (and some swearing) the studs went in and the exhaust cross box and brake ducts were secured with the supplied nut and washers.

2CV exhaust cross box stud

Of course, the real key to the operation was the supervision of the car’s owner.

The owner of a 2CV inspecting the tools carried

V series mounting studs

The 652cc V series engine had a few changes from the M series engine it was based on.  One of these was stud mounts for the fuel pump and the engine breather/ oil filler rather than the bolts used on the M series.

As the stud mounts make it easier to fit the relevant accessories the SPOG produce stud conversions for the M series engines that replicate those found on the V series – as shown below from the Haynes Manual for the Visa.

2CV crank case build up

After removing everything from the crank case I cleaned it up with industrial strength degreaser and a pressure wash.

The dipstick guide had a bit of surface rust so that was cleaned up and painted with a couple of coats of black Hammerite.

The oil filler/ breather normally attaches with a pair of bolts but the V series engine had more practical studsSPOG sell a pair of studs for the A series engine which are easily fitted (with a bit of thread lock for good measure).

2CV engine breather studs prior to fitting

The longer stud with the thicker band goes on the off side as there is an alternator mounting plate on that side in addition to the breather.

2CV enginer breather studs in-situ

A new low oil pressure sender was fitted, complete with washer.

2CV low oil pressure sender fitting

This one needed a 22mm spanner.

2CV low oil pressure sender fitting with 22mm spanner

The oil pressure relief valve piston was liberally coated with fresh oil and inserted.

2Cv oil pressure relief plunger being inserted

When fully home the only the nose stands proud of the housing.

2CV oil pressure relief valve plunger in situ

The spring sits over the nose of the piston and, as I didn’t have a new copper washer, I annealed the old one by heating it until it was red hot and then letting it cool slowly.

2CV oil pressure relief valve fitting

The bolt is a 17mm and I don’t have a tightening torque for this so  I went with a good strong tweak with the breaker bar which should be enough to crush the washer slightly.

2CV oil pressure relief valve fitting

Another SPOG item is the 3/4″ thread oil filter spigot.  A bit of thread lock and this was firmly screwed into the oil filter mounting plate.

2CV oil filter adaptor prior to fitting

With a new o-ring and some sillyfoam sealant the mounting plate was re-attached to the crank case with the two alan bolts.

2CV oil filter adapter in situ

One of the advantages of the much more common 3/4″ thread is that a sandwich plate can be mounted.  In this case I’ve got oil temperature and pressure senders – important information to have available for an air/oil cooled engine.

Sandwich plate with oil pressure and temperature senders on a 2CV crank case

As I’m planning to fit an electric fuel pump I’ve got a stainless steel blanking plate for the standard, mechanical, fuel pump mounting point.  This is important as, without the actuator rod, omitting the fuel pump would leave a hole in the crank case.

2CV fuel pump mount with silicone sealent

After applying a generous amount of high temperature sillyfoam sealant the blanking plate was secured with stainless steel M7 nuts.

2CV fuel pump blanking plate