1967 Lamborghini Miura P400 (RG)
Service Log by Dan Mooney



We are delighted to have been entrusted with the care and servicing of this beautiful Lamborghini Miura P400.

The current project involves rebuilding the rear brakes, installing a Quick Silver stainless steel header set and exhaust, upgrading the clutch hydraulics and repairing some minor body damage beneath the front valance.



Update report - December 23, 2017
The paintwork repairs to the lower valance have now been completed.

Performing some minor body repairs beneath the nose of the car. Prior to replacing the old shock absorbers, the front end had been bottoming out and causing damage to the lower valance. Our repairs are now virtually complete and we expect to be painting the valance early next week.

Prior to replacing the front Koni shocks the car had
been bottoming out, damaging the lower valance
This was the worst of the damaged areas

Panel is cracked around the hinge

A small hole was lurking beneath this previously
repaired area
Metal to Metal aluminum based filler

Repaired panels now ready for priming

Damaged areas now primed
Repaired areas will be painted early next week

Using the Spies Hecker color match camera
Glad to see I am not the only person working
at the weekend (Valentino Balboni video)

Today's update outlines the correction of a couple of issues related to the Miura plug wires. The first problem was that the conduit brackets were held to the cam covers by extremely flimsy little wire clips, all of which had been repaired (soldered) several times in the past. The next issue was that the conduit clips were installed 180 degrees out, meaning the plug wires ran down the center line of the engine, rather than sitting beneath the shields.

Chris fabricated new conduit clips from stainless steel stock. They look almost identical to the originals, but a far sturdier. He then installed the new clips so that the plug wires are now protected and hidden by the shields.

Next task (already underway) is the repair and paintwork of the damaged bodywork beneath the nose of the car.

The plug wires had been sitting along the
center line of the engine
Original clips were extremely flimsy and were
constantly breaking

Chris decided to fabricate new clips

Installing the new clips

Plug wires and clips now hidden beneath shields
Job done!

The headlamps on the Miura had recently stopped working and they were also suffering from decades of grime and condensation stains behind the lenses. Chris has now removed and disassembled both headlamp assemblies, cleaned all the internals and corrected the electrical issues.

Both headlamps were a little grimy behind
the glass lenses
Disassembling the lamps for a thorough cleaning

Inner edge of glass lenses were stained following
many years of condensation

Reassembling headlamps after cleaning
Looking a lot better!

Electrical issues resolved, headlamps fully
functional once more

I am pleased to report that we have completed our upgrade of the clutch hydraulic system and the clutch is working perfectly, with a noticeable improvement in pedal feel. Thanks to Valentino Balboni for the recommendation and advice!

Rocker panel removed, exposing the fire
extinguisher line
Comparing old (L) and new fitting bore ID

Old fitting
New fitting approximately .035" larger

Time to address the clutch master cylinder

Before modification
Almost .050" greater ID after modification

Fabricating and installing the new hydraulic
hard line
Our new hydraulic line is the straight line
in this picture!

Showing where the new hard line meets up with the
new flex line (using original mounting holes)
Showing the new flex line terminating at the slave

We took the opportunity to tidy up the routing of
the fire extinguisher and brake lines
Rocker cover replaced, clutch upgrade now

We have already rebuilt the rear brake calipers and installed the new Quick Silver headers and exhaust. Having investigated the clutch hydraulics, we believe the biggest restriction is in the aftermarket braided clutch line, not the ports of the master and slave cylinders. That being the case, we are going to replace the small bore braided line with larger steel line to see if that provides a lighter clutch pedal feel.

Caliper pistons are rusty and will be upgraded to
new stainless pistons

New seals and pistons installed

Rebuilt calipers now reinstalled
Investigating the bore size of the clutch slave

Hydraulic line makes a 90 degree turn immediately
after leaving the clutch master cylinder

Braided clutch line has very restrictive bore
Time to remove and replace the old headers
and exhaust

Removing the left hand header

New Quick Silver system fits beautifully

Update report - October 14, 2017
Earlier today legendary Lamborghini factory test driver Valentino Balboni piloted this beautiful Miura for three "aggressive laps" around MSR in Houston. Mr. Balboni had driven the car previously and I am proud to report that he declared our recently completed mechanical work a complete success. He told the owner of the car, who was a passenger for the laps around MSR, "It is like a different car...better than expected."

Click on the photo below for a short video clip of the legend behind the wheel.

Update report - October 10, 2017
I am pleased to report that we have now completed the transmission rebuild and been busy tuning the rebuilt Webers on the Dyno. Earlier today I took the car out for some initial road testing, which went very well.

Click on the image above to watch a short video of the car going through the gears on the Dyno

Road test video # 1
Road test video # 2

Installing the engine and transmission after
the rebuild
Preparing to reinstall rear clip/engine cover

Time to run the car through its paces on the Dyno
Tuning the rebuilt Webers on the Dyno

We have now completely rebuilt the Weber carbs and will be wrapping up the transmission rebuild in the next couple of days. We are on schedule to reinstall the engine and transmission on Wednesday of next week.

Carb prior to disassembly

Air corrector jets were very sooty

Measuring float height

Cleaning carb bodies

Carbs now fully rebuilt

Comparing old (L) and new (R) synchros

Assembling the main shaft with
new synchros

This is the shifter box
New gaskets used as we go back together with
the transmission

Installing the diff spacer (bearing retainer)

Assembling the shifter box

Removing and disassembling the transmission for rebuild.

8mm wrench has apparently been wedged in
place for many years...
Removing the clutch cover

Differential is in good condition

2nd gear synchro is in very bad shape

Comparing new 2nd gear with original (on right)
Comparing old and new synchros

Plenty of evidence this is not the first time the
transmission has been apart

When the time comes to go back together with this project, we will upgrade the headers and exhaust with a superb quality replacement system from Quick Silver in England.

Headers are no longer serviceable
New 304 stainless steel Quick Silver system

I am pleased to report that we now have this project underway. Interesting to note that the engine is date stamped July 27, 1967, meaning we removed it on its 50th birthday!

Work underway
Rear clip will add a little Italian flair to my office
for a few weeks

Webers will be rebuilt

Engine and transmission removed
Interesting that the engine was removed on
its 50th birthday!

Cylinder heads are also date stamped

The following photographs cover the relocation of the driver's seat belt shoulder anchor, and the installation of new front brake rotors.

Installing a seat belt anchor point over the
driver's left shoulder
Cutting an access panel behind the seat belt
mounting point

Fabricating and installing a panel so back side
of seat belt anchor can be accessed
Belt now positioned over driver's shoulder, rather
than across his neck

Horns replace, now working

Installing new front brake rotors

Lock tabs folded over
Rear tabs had not been previously folded, which
has now been corrected

Today we have been fabricating and installing new brake lines and balancing the road wheels. Previous balance weights had been glued in position where they contacted the calipers when the wheels rotated. There is so little clearance between the top of the calipers and the inner surface of the wheel rim, that you really have to use clip on weights attached to the inner bead. Several of the old balance weights were missing altogether and others were barely attached.

Hard lines to rear calipers were strained and
actually cracked open when removed
New lines were fabricated and installed

New line fabricated and installed much tighter
around top of front right caliper
After cleaning FR inner rim, damage caused by old
brake line contacting inner rim clearly visible

Balance weights had been glued where there
was insufficient clearance for calipers
Cleaning inner rims prior to re-balancing wheels

Bead clip balance weights are a simple fix
to caliper clearance problems
All 4 door hinge pins are now secured with
cotter pins and E clips

Another productive day working our way through several issues. Unfortunately we discovered a few new issues, such as brake lines rubbing inside wheels, and defective air horns, etc, but we were still able to check off several items today.

Brake line rubbing against inner rim of
front right wheel
Witness marks show where brake line has been
contacting inner rim

Engine cover release handles were missing
grommets on both sides
Missing rubber grommets caused handles to rattle
and clunk around

A little shrink wrap and a custom elliptical rubber
washer was a cheap and cheerful fix
Lock nut was missing from the back of the driver's
side handle - now installed

Door hinge pins need securing
Upper passenger side pin literally about to fall out

#3 fuse was vacant and keyed, so we decided
to use it for the new fan relay
Fan relay now wired in

Fan relay positioned by battery
New circuit breaker

We are happy to get this new project underway. Our first task will be to address several electrical issues. We have already rebuilt the right hand headlamp mechanism, installing a new bronze crank gear, rewired the headlamp motor and rebuilt and rewired the fog lamp switch. You now have fully operational headlamps and fog lamps.

RH exhaust tip has been pushed up into the rear
valance, causing slight damage to the valance

Slightly damaged chassis tube extension
Brake rotors will be replaced

Damage under front right corner

Small dent at front left corner
Inoperative fog lamps are loose on their mounts

New bronze gear will be installed in RH
headlamp mechanism

Headlamp motor was wired incorrectly

Auxiliary (switch operated) fan was inoperative
Clock is inoperative. Good power and ground, so
almost certainly internals bad.

Both headlamps now operational