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Peugeot 504 —
the coupés' and cabriolets' V6

The elegant 504 Coupé and Cabriolet are among the very first cars to receive the PRV: the carburetted 2,664 cc, code ZM, 136 bhp — the most elegant way to travel behind the Douvrin V6.

136
bhp · carburetted ZM
2664
cc · 12 valves
1975
among the first five PRV models
2
bodies: coupé and cabriolet
Engines

One code only: ZM

At Peugeot the Douvrin V6 gets an in-house code — PRV engine codes are only ever Peugeot, Renault or Volvo. The ZM is the first-generation carburetted 2,664 cc: non-offset crankpins, uneven firing, 136 bhp. It powers the 504 Coupé and Cabriolet, and the 604 SL.

Peugeot 504 First generation · carburettor Every known code →
ZM · ZMS136 bhp
2,664 ccCarburettor12 valvesZM engine file →
504 Coupé and Cabriolet V6 — the original PRV at Peugeot, shared with the 604 SL. The Peugeot workshop sheets for this engine are still missing from the Library.
The first wave

Five models before the end of 1975

By the end of 1975, at least five PRV V6 models were on sale, barely a year after the Volvo 264 that led the way in October 1974. The 504 Coupé and Cabriolet and the big 604 saloon flew the lion's colours in that first wave, with the same carburetted ZM; the 505 V6 would later carry the lion's V6 up to 170 bhp.

Peugeot's PRV codes — ZM, ZMJ, ZNJ, ZN3J, then ZPJ and ZPJ4 — are detailed code by code on the Engines page.

5
PRV MODELS ON SALE BY END 1975
1974
VOLVO 264, THE FIRST
136
BHP · ZM
7
CARBURETTED CARS
The lion and the V6

Three Peugeots before the twins

The most elegant way

The coupé and the cabriolet receive the carburetted 2,664 cc, 136 bhp — the most elegant way to travel behind the Douvrin V6. Seven road cars had a carburetted PRV V6: Peugeot 504 and 604 (2.7 L, 136 bhp), Renault 30 (131 bhp), Volvo 260 (125 bhp), Alpine A310 V6 (150 bhp), Talbot Tagora (166 bhp — the most powerful of the carburetted 2.7s) and, alone in 2.8 L, the naturally aspirated Alpine GTA (160 bhp).

604 and 505, the saloons

The 604 carried the PRV through its whole career — carburetted SL, K-Jetronic injected Ti and STI, 155 bhp GTI with the 2,849 cc — and the 505 V6 carried the 170 bhp LH-Jetronic ZN3J, the most powerful of the three. The sequel is written with the 605 and its 200 bhp 24-valve.

No document, for now

No document specific to the 504 V6 is in the Library yet — if you own one, the Contribute page awaits you. Meanwhile, the 2.7-litre's family figures — weight, main bearings, valve timing — come from the first manual of a PRV car, the Renault 30's.

In the workshop

What is known of the 504's 2.7-litre

The family figures of the first-generation 2.7-litre — drawn from the Renault 30 manual (March 1975), the same engine out of Douvrin, no Peugeot document being in the Library yet — and the FAQ answers that concern her.

Peugeot 504 The full FAQ →
Peugeot
Which Peugeots got the PRV V6?
Five models: 504 Coupé & Cabriolet, 604, 505, 605 — and the P4 V6, a very limited civilian series. 504 · 604 · 505 file → · 605 file → · P4 V6 file →
Carburateurs
Which cars have a carburetted PRV V6?
Seven models: Peugeot 504 and 604 (2.7-litre, 136 bhp), Renault 30 (131 bhp), Volvo 260 (125 bhp), Alpine A310 V6 (150 bhp), Talbot Tagora (166 bhp — the most powerful carburetted 2.7) and, the only 2.8, the naturally-aspirated Alpine GTA (160 bhp). All vehicles →
Codes
Did Alpine, DeLorean, Lancia or Eagle have PRV engine codes of their own?
No. Every PRV V6 carries a code from one of the three partners: the Douvrin Z-codes at Renault (Z6V, Z7V, Z7U, Z7W, Z7X) and at Peugeot — shared with Citroën within PSA (ZM, ZMJ, ZNJ, ZN3J, ZPJ, ZPJ4) — and the B-codes at Volvo (B27, B28, B280). The other marques bought the engine as it was: Alpine under Renault codes (Z7U in the GTA Turbo, Z7X 744 in the A610), DeLorean under the Peugeot ZMJ (ZMJ-159 variant), Eagle and Dodge under the Z7X (711 and 715), Lancia under the ZN3J, Venturi under Z7U, Z7W and ZPJ4 units prepared by EIA. No carmaker ever struck a PRV code in its own name. Every known code →
Poids
How much does a PRV V6 weigh?
About 152 kg with its ancillaries, according to the Renault 30 manual — the first car to receive it. The manual also gives the complete unit: 225 kg for the « engine + manual gearbox » assembly, 240 kg for « engine + automatic gearbox ». These figures are for the 2,664 cc of 1975; they give the order of magnitude of what you lift when you take a PRV out. Renault 30 M.R.167, folio B-3.
Paliers
How many main bearings does the PRV V6 crankshaft have?
Four, never five — the consequence of a V6's three crankpins, where an inline six lines up five. Three factory manuals say so in the same words, twenty years apart: the Renault 30 M.R.167 of March 1975 (folio B-9), the Alpine A310 2700 VA repair guide (folio B-10) and the Renault « Z engines » workshop manual, which adds « all types » (folio 10-35). M.R.167 folio B-9 · A310 guide folio B-10 · Z engines manual folio 10-35.
Épure
Do both cylinder banks of the PRV V6 share the same valve timing?
No. The Renault 30 M.R.167 gives two separate columns, for a theoretical clearance of 0.7 mm: left bank (A) — inlet opens 9° BTDC and closes 45° ABDC, exhaust opens 45° BBDC and closes 9° ATDC; right bank (B) — 7° and 43° at all four points. Two degrees separate the banks. Renault 30 M.R.167, folio B-8.
Soupapes
What are the valve seat angles of the PRV V6?
30° on the inlet, 45° on the exhaust — the two are not cut at the same angle. Seat widths follow: 1.7 mm inlet, 2 mm exhaust. Stem diameter is 8 mm for both, and head diameters are 44 mm inlet against 37 mm exhaust. The camshafts run in four bearings, with 0.07 to 0.14 mm end float. Renault 30 M.R.167, folio B-7.

In the Library

No Peugeot document for the 504 V6; the first-generation 2.7-litre is documented by the Renault 30 manual: M.R.167 Renault 30 — the first-generation 2,664 cc

On the forum

The 504 has its own section on the forum — presentations, restorations, questions to members who drive one. Peugeot 504 section →

The code behind the 504

ZM — the lion's carburetted 2.7-litre, and the 604 that shared it before moving to injection.

ZM file →604 file →505 file → All vehicles →