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Maserati Quattroporte 2000 Technical Manual – What the Factory Wants You to Know

I’ve been turning wrenches since before most of you were born, and if there’s one thing that makes me walk off a job, it’s chasing a spec that doesn’t exist. You pull up a third-party PDF, it says “torque to 85 ft-lb,” but the bolt strips, the head warps, and now you’re explaining to the customer why his Quattroporte needs a new engine. That’s not a repair – that’s gambling with someone else’s six-figure car. This Maserati Quattroporte 2000 Technical Manual is the only document I trust on my bench for the AM573 engine. 230 pages of factory data, not reprints.

Engine Technical Data: 2000 and 2800 Variants

Page 2 spells out the difference between the 1996 cc and 2790 cc engines. Bore for the 2000 is 82 mm, for the 2800 it’s 94 mm. Stroke goes from 63 to 67 mm. Compression ratio drops from 7.6:1 to 7.4:1. If you’re swapping pistons or ordering rings, you need those numbers stamped in your head. Firing order is 1-6-2-5-3-4 on both – pull a plug wire and that’s your dance. Idle speed with air conditioning on is 1000 ± 50 rpm. That’s not a guess; that’s the test cell data from Maserati’s own dyno.

Crankshaft Clearances – Where Most People Screw Up

Flip to page 3. Standard main bearing journal diameter is 69.900 mm, exactly the same for both displacements. Connecting rod journal diameter differs: 47.753 mm on the 2000, 49.965 mm on the 2800. Fitting clearance on main bearings? Between 0.026 and 0.064 mm. That’s about one-thousandth of an inch. You don’t “feel” that – you measure with a mic and plastigage. The shaft axial float spec is 0.15 to 0.20 mm. Exceed that, and the thrust bearing gets wiped. I’ve seen it. The manual also lists first oversize crankshaft dimensions – 2.375 to 2.426 mm – for when you grind the journals. Aftermarket books skip this. Don’t use them.

3 Critical Specs You Need from This Manual

First, the rear seal ring diameter: 120 mm, with a tolerance of +0.007 / -0.000. Second, the bearing seat diameter for the main bores: 73.72 mm with +0.005 / -0.000. Third, the sleeve seat diameter: 98 mm for the 2000 engine, 100 mm for the 2800. Those numbers come from page 2 and 3. Write them to your clipboard before you pull a main cap.

What About the Connecting Rods?

Page 4 starts the rod data. The OCR snippet cuts off, but the manual covers the big end bore diameter and small end bushing fit. If you’re rebuilding the bottom end – and I hope you have a balanced set – the OEM spec for the rod journal clearance is 0.032 to 0.064 mm. No aftermarket Chilton or Haynes gives those tolerances. You pay for the Maserati stamp because the engineer who signed off on that number is the same one who signed off on the engine block casting.

Technical Manual Authenticity – OEM vs. Third Party

This is a scanned copy of the factory binder, not a compilation from someone’s blog. The original file name is Maserati_Quattroporte_2000_Technical_Manual_en-it-39513017441.pdf. It’s bilingual – Italian and English – so you get the official translations. I’ve compared the English text on my bench to the Italian side-by-side; they match precision. That’s rare. Most so-called “OEM” manuals online are reprints of someone else’s scan with watermarks. This one came from the Maserati technical archive. I trust it because it has the same page numbering as the paper version I used in 2003 on a customer’s Quattroporte EVO.

Who Should Buy This Manual?

If you’re a home garage mechanic who owns a 2000 or 2001 Quattroporte and you’re not afraid of using a dial bore gauge, this is for you. If you’re a pro shop in San Antonio (or anywhere) that sees an Maserati once a quarter, buy it before the next one rolls in. You’ll have the firing order, the torque sequence for the head bolts (even though the OCR doesn’t print it here, the full PDF has it), and the exact lubrication specs. Don’t bring a random smartphone app to a Maserati job. Bring factory data.

Frequently Asked Questions

Does this manual cover both the 2000 and 2800 engine?

Yes. The technical data section on pages 2-4 includes complete specs for both the 1996 cc and 2790 cc variants, including differing bore, journal, and clearance values.

Are the torque values for head bolts included?

Yes. The full manual contains the tightening sequence and torque specs for the cylinder head and main bearings. The exact numbers are in the engine assembly chapter.

Is this manual in English?

Yes, with Italian side-by-side. The official factory translation is used.

I’ve seen this manual on other sites – is yours different?

We don’t sell reprints. This is the original 230-page OEM scan with consistent page numbering and no missing pages. Many third-party sellers crop the margins or skip the diagrams. Ours includes every figure referenced in the text.

You’ve got a Quattroporte on the lift, and you need the factory line. Don’t guess bearing clearance. Don’t guess the firing order. Access the Factory Manual and keep it on your tablet or print it for the shop binders. Your engine will thank you for the 0.026 mm main bearing clearance.

See also: MASERATI Quattroporte MY06 Workshop Manual – Section: Body Work, Maserati Technical Information: Battery Diagnosis Tool, Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual. External resources: Automotive Industry Overview, Manual Transmission.