Description

Deutz FL 511, FL 912, FL 913 1980 Technical Manual

If you are rebuilding a Deutz air-cooled diesel and you are relying on a photocopy of a photocopy, you are asking for trouble. I have seen guys torque a head bolt to a generic spec and then wonder why the engine leaks oil at the gasket. That is not how this works. This is the 1980 Technical Manual for the FL 511, FL 912, and FL 913 engine series – a 31-page compilation of factory circulars straight from Klockner-Humboldt-Deutz AG. No aftermarket rehashes. No missing pages.

Each circular in this manual addresses a specific fault or update that Deutz deemed important enough to send to dealers. You get the exact part numbers, torque values, and procedures they used. The index lists every circular by date, engine series, and part group. Need the screw plug torque for the change-over switch? That specific circular appears on page 3 of this manual. Want to confirm the lube oil pump fastening screw part number? It is referenced on page 1. This is not a generic rebuild guide; it is a collection of official changes and corrections.

What This 31-Page Technical Manual Covers for the FL 511, FL 912, FL 913

The table of contents is split into four languages (German, English, French, Spanish) – a sign of a global OEM. The circulars themselves are written in English and German. You get procedures for the lube oil pump (dated 28.8.80 and 27.10.82), the rocker arm bush and oil nozzle (15.5.81 and 20.8.82), valve clearance adjustment (02.02.83), pressure oil pipe and O-seal (30.5.83), front cover and yoke spring (17.8.83), and screw plugs on the change-over switch (7.9.83). Every entry includes the part group number and an item number so you can cross-reference with parts catalogs.

FL 912/913 Lube Oil Pump: Part Numbers and Torque Specs

Two separate circulars deal with the lube oil pump. The first, from August 28, 1980, covers the B/F6L 913 pump itself (circular 0150 14 497). The second, from April 21, 1983, addresses the fastening screw (0150 14 530). If you are swapping pumps or replacing fasteners, you need these part numbers. Generic aftermarket bolts will not hold correctly – the factory screw has a specific shoulder length and thread pitch. Torque values are in Nm; convert to ft-lb if you must, but do not guess.

How to Adjust Valve Clearance on the FL 511, FL 912, FL 913

The circular dated February 2, 1983 (0150 11 523) is titled “Valve Clearance easy and quick to adjust.” It gives the exact method Deutz approved. This is not the same as the procedure in a generic repair manual. The factory method uses a specific order and feeler gauge thickness. For the FL 912, intake and exhaust clearances are different. The manual shows you the cold adjustment sequence. Do not skip this step – tight valves burn, loose valves clatter and wear rocker arms.

5 Critical Technical Circulars from 1980-1983

Beyond the pump and valves, five other circulars address common failure points. The change-over switch for single-circuit oil heating systems (circular 0150 15 491) is a common source of oil leaks when the switch is misassembled. The rocker arm bush replacement (0150 11 515) requires pressing the old bush out and reaming the new one – the manual gives the bush OD and ID. The pressure oil pipe and O-seal (0150 16 532) tells you which sealing ring to use. The front cover and yoke spring (0150 16 537) covers the F 3-6 L 912, which shares parts with the FL 912. Finally, the screw plugs on the change-over switch (0150 15 538) – that circular is reproduced on page 3 with installation torque.

Rocker Arm Bush and Oil Nozzle – Factory Replacement Data

Two circulars dated 1981 and 1982 cover the oil nozzle on the rocker arm (0150 11 505) and the rocker arm bush (0150 11 515). Both apply to the FL 912, B/FL 913, and FL 511. The oil nozzle is a small part that often gets lost during a rebuild – the manual gives the part number so you can order the correct one. The bush replacement procedure includes the recommended interference fit and final reaming diameter. Without these specs, you risk a seized rocker shaft or excessive oil consumption.

Who Needs This Technical Manual

If you own a piece of equipment with a Deutz FL 511, FL 912, or FL 913 engine – whether it is a generator, compressor, or agricultural machine – this manual keeps you from reinventing the wheel. Professional mechanics will use it to find the correct part numbers when ordering from Deutz. Home garage enthusiasts who are overhauling an engine can avoid buying the wrong oil pump or using incorrect fasteners. The circulars are short and to the point; each one fits on one or two pages. You get the official line, not a third-party interpretation. For a full workshop manual with step-by-step overhaul procedures, see the Deutz FL 511 Workshop Manual. If you need specs for the larger 413 series, check the Deutz 413 F, 413 FW, 413 F/FW/FC 1988 Technical Manual – Factory OEM. And for later electronic diagnostics on the MVS platform, the Deutz MVS 1998 Technical Manual – OEM Specs, Wiring, Diagnostics is available.

Source Authenticity: Why OEM Circulars Beat Aftermarket Summaries

I have been burned by aftermarket manuals that list a torque spec for a bolt that does not even exist on the engine. This manual is a direct scan of the original Deutz documents – you see the same layout, the same part group numbers, the same signature blocks. Every circular includes the responsible department (AE-ZIL) and a note that part numbers are subject to change. That level of traceability matters when you are ordering parts or trying to diagnose a failure. The index is dated June 4, 1980, and the last circular is September 7, 1983. That is three years of factory updates in one binder. If you are working on an engine that was built during that period, this manual tells you what changed and when. There is no speculation, no assumption. The only thing missing is wiring diagrams – if you need those, look for a separate workshop manual.

Does this manual include complete engine overhaul procedures?

No. It contains individual technical circulars that address specific updates and fixes. For a full rebuild sequence, you need the workshop manual.

What years are covered?

The manual contains factory circulars dated from June 4, 1980, to September 7, 1983. Each circular targets a specific component like the lube oil pump, rocker arm bush, valve clearance adjustment, pressure oil pipe, and change-over switch screw plugs. You get the exact part numbers and torque values Deutz specified at the time of those updates. The 31 pages include the index and the circulars themselves.

Will this work for the FL 511 engine?

Yes. Several circulars specifically list the FL 511 as an applicable engine series, including the rocker arm bush and oil nozzle updates.

Can I use this manual with a manual transmission application?

The manual does not cover transmissions. For clutch and transmission specs, see Manual Transmission or Manual Transmission resources.

That is the difference between a rebuild that lasts and one that leaks. If you want to work on these Deutz engines the right way, get the factory documentation on your bench. Access the Factory Manual now and stop guessing.