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Z6V —
the Renault 30's 2.7

The Z6V is the carburetted 2,664 cc of the PRV V6's first generation — 131 bhp — and the first PRV V6 fitted to a Renault: it was for the Renault 30, the marque's flagship, that the engine's development was hurried along.

2 664
CC
131
BHP
1975
FIRST PRV RENAULT
First generation

The PRV as it was born

The Z6V belongs to the PRV V6's first generation (1974–1985): non-offset crankpins, uneven firing, carburettor fuelling — 2,664 cc and 12 valves. It is the engine of the Renault 30, the first Renault to receive the Douvrin V6, in 1975.

Its mechanical-injection twin, the 144 bhp Z7V, would power the Renault 30 TX and then the Renault 25. The Renault 30 repair manual — M.R.167 — is in our Library, and much of what the FAQ knows about the first generation comes from it.

Z6V
DOUVRIN CODE · 2,664 CC · CARBURETTOR · 12 VALVES
2664
CC
Carbu.
FUELLING
12
VALVES
Identity

What makes a Z6V a Z6V

Figures read in the constructor's documents held in our Library — repair manuals, Pub et Trade data sheets, period bulletins. Nothing here comes from a web fact sheet.

Z6V 2,664 cc · carburettor · 12 valves · first generation M.R.167 Renault 30 →
88 × 73
2,664 cc — bore × stroke 88 × 73 mm, the PRV's original displacement, the same as the injected Z7V's and the Alpine A310's type 112.7.30.
Manetons
Non-offset crankpins, uneven firing — the first generation's signature, put right in 1985 by the Z7U's forged crankshaft with offset crankpins.
152 kg
About 152 kg with its ancillaries, according to the Renault 30 manual; 225 kg for the engine + manual gearbox assembly, 240 kg with the automatic — the figures of the 1975 2,664 cc.
1-6-3-5-2-4
Firing order 1-6-3-5-2-4, like every PRV. To time the camshafts, the manual sets piston no. 1 at 15 mm before top dead centre — the FAQ explains why.
Known variants

One code, one car

The Z6V had a single application: the carburetted Renault 30. Its injected twin carries the Z7V code — the full code table is on the Engines page.

Z6V 131 bhp Every known code →
Z6V131 bhp
Carburettor12-valve
Renault 30 (1975) — the first PRV-engined Renault.
On the road

The cars of the Z6V

Renault 30 →

The first PRV-engined Renault, launched in 1975: 131 bhp with a carburettor (Z6V), then 144 bhp with injection (Z7V) on the 30 TX. The model file details both engines.

In the workshop

What the documents say about the Z6V

Answers taken from our FAQ, each one read in the Library. The full FAQ holds several hundred more, engine code by engine code.

The Z6V, in the documents The full FAQ →
Culasse 1975
How was a PRV's cylinder head tightened in 1975, and how does it differ from the Z7X?
By a different method, and one that asks for a re-torque at 500 to 1,000 km. The Renault 30's M.R.167 sets it out in two parts. At head fitting: all bolts in the prescribed order first to 2 m.kg, then to 6 m.kg, to seat the head gaskets; then the “re-torque” below. Re-torque — engine cold, minimum cooling time 6 hours: slacken bolt no. 1 alone and bring it back to 2 m.kg with the Mot. 50 torque wrench, then do the same with each of the others one at a time, in the order shown; then the final tightening with the Mot. 591 angle gauge set between wrench and socket, pointer on zero, each bolt turned until the pointer stands over 115°, in order. The manual calls for this re-torque at 500 to 1,000 km — at the free service check, after any head removal, and after an engine exchange. And one prior check without which no torque figure means anything: the head bolts must run freely in their threads — if not, screw them in and out several times before assembly. Set that beside the Z7X of the A610 and the Safrane: 6 daN.m, then every bolt slackened at once, 4 daN.m and 180°, and a cold re-torque that adds 50° without any slackening. Same family, two generations, two procedures that must not be mixed: slackening a Z7X bolt to re-torque it, or skipping the slackening on an early engine, both break the method. Renault 30 M.R.167, folios B-25 and B-37 · Alpine M.R.297, folios 11-6 and 11-7 · Safrane M.R.302, chapter 11.
Allumage
How is the ignition timed on a Renault 30 V6?
Each cylinder bank is set separately. Dwell angle: 76°, which reads 38° on the six-cylinder scale of the diagnostic centre, or 63% on a percentage dwell meter — set on screw C, at cranking speed. Ignition point: 10° ± 1°, at a steady 900 rpm idle, distributor vacuum pipe disconnected. The manual warns twice: re-check the setting after tightening the distributor, and do not touch the dwell angle again once the timing is right. Renault 30 M.R.167, folio C-6.
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.
Distribution
What torques and precautions apply to a Renault 30's timing end?
Two torques far apart, and several details that make the difference between a dry timing case and a leaking one. The oil pump drive sprocket bolts go in with Loctite and only 0.6 m.kg — a small figure on small bolts, easy to overshoot. The timing cover gasket goes on dry; the cover is located by two dowels, and its lower bolts get Loctite. Once it is on, trim the gaskets flush at the upper cylinder head joint faces, so that nothing stands proud under the head. At the front: fit the pulley's oil seal with the Mot. 658 fitting sleeve, oil the pulley's sealing face before sliding it on, put Loctite on the crankshaft thread, hold the crankshaft with the Mot. 592 tool, and lock the nut at 17 m.kg — the Alpine V6 GT, same seal with Mot. 658 and same oiled pulley, tightens its own to 18 daN.m with Loctite Frenbloc, then refits the TDC sensor's holding plate. A pulley refitted dry on its seal, or a nut refitted without thread lock, are the two classic sources of a front-end leak or a pulley working loose. On the head side, when replacing a gasket: two 3 mm rods slid sideways into the centring dowel bores stop the dowels being driven into the block as the head goes on; head gasket new and dry; camshaft stop fork withdrawn far enough not to bind the camshaft, then engaged in its groove and tightened to 1.5 m.kg; camshaft sprocket bolt at 7.5 m.kg and that bolt's blanking plug at 3 m.kg. Renault 30 M.R.167, folios B-35 and B-45 · Alpine M.R.273, folio B-26.

In the Library

The Renault 30 repair manual, in two volumes, and the Z-engines manual — searchable page by page: M.R.167 Renault 30 — engine · M.R.167 Renault 30 — ignition · Z-engines repair manual

The rest of the family

Architecture, generations and every known engine code of the PRV V6 — on the main Engines page.

Z7V — the 2.7 injection →Z7U — the 2.5 turbo → All PRV engines →