Lombardini issued document 1-5302-467 as the factory shop manual for its 15 LD diesel engine series, and this 74-page Lombardini 15 LD 350 shop manual PDF is that book, covering five variants from the 225 to the 440. Disassembly and reassembly fill about a third of the book, walking you through valve guide insertion, ring end gap, crankshaft endplay, and camshaft and balancer timing. The fuel chapter follows the injection pump from plunger to static flywheel timing and injector calibration; the electrical chapter carries 12V ignition wiring diagrams, alternator recharging curves and starter motor data. Set the antireverse weight clearance to 1 mm on the 400 and 440, then take the cylinder head through all five phases, starting at 30 Nm with a 180° back-off and a 52° turn to follow. Nobody torques an angle-sequence head from memory. Bookmarked and text-searchable, the PDF keeps every clearance in reach at your bench until the engine is reassembled and running.
What's Inside This Lombardini 15 LD 225–440 Manual
| System | Pages | Key Topics |
|---|---|---|
| Troubleshooting | 7 | Fuel Circuit, Lubrication, Settings, Repairs |
| Safety Decals - Safety Instructions | 8-10 | Safety and Warning Decals, Safety Instructions |
| Model Number and Identification | 11 | Model Number, Engine Identification |
| Technical Data | 12-13 | Characteristics 15 LD 225, Characteristics 15 LD 315, Characteristics 15 LD 350, Characteristics 15 LD 400, Characteristics 15 LD 440 |
| Overall Dimensions | 16-17 | Ld 225, Ld 315, Ld 350, Ld 400, Ld 440 |
| Maintenance - Recommended Oil Type - Refilling | 18-19 | Maintenance, Fuel, Recommended Oil, Oil Supply, Acea Sequences |
| Disassembly / Reassembly | 20-45 | Automatic Decompression, Availability of Bearings, Cam Height, Camshaft, Camshaft - Antireverse System, Camshaft End Play, Camshaft Journals and Bore, Camshaft Timing |
| Lubrication System | 46-50 | LD 225 - 315 - 350 Lubrication System, LD 400-440 Lubrication System, Calibrated, Internal Strainer, Oil Filter, Oil Pressure Check, Oil Pressure Curve at Full Speed |
| Fuel System | 51-60 | Feed Pump, Fuel Filter 15 LD 225-315-350-400-440, Fuel Filter 15LD 225, Fuel Pump, Drive Rod Protrusion, Fuelling/Injection Circuit for 15 LD 315-350-400-440 |
| Electrical System | 61-66 | 12V Electric Ignition Layout with Motor Protection, 12V Electric Starter Diagram with Voltage Regulator Built Into the Ignition Panel, 12V, 12A Electric Ignition Diagram |
| Settings Adjustements | 67-69 | Adjustments - 15 LD 315-350, Adjustments - 15 LD 225, Full Speed Setting in No-Load Conditions, Idle Speed Adjustment, For Small Car Versions |
| Storage | 70 | Temporary Protection, Permanent Protection, How to Prepare the Engine for Operation |
| Torque Specifications | 71-74 | Standard Bolt Torque Specifications |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt torque | 1st phase: 30 Nm, 2nd phase: unscrew 180°, 3rd phase: 20 Nm, 4th phase: 52° turn, 5th phase: 10 Nm | p. 27 |
| Feed pump screw torque | 15 Nm | p. 52 |
| Fuel filter 15 LD 225-315-350-400-440 filtering area | ≥ 390 cm² | p. 52 |
| Fuel filter 15 LD 225-315-350-400-440 filtration level | ≤ 7 µm | p. 52 |
| Feed pump delivery | 40 l/h | p. 52 |
| Drive rod protrusion | 1.5-1.9 mm | p. 53 |
| Distance from flywheel rim surface to starter motor flange surface | 17.5-19.5 mm | p. 65 |
| 15 LD 400-440 | ||
| Camshaft gear cover tightening torque | 25 Nm | p. 41 |
| Clearance between weight A and surface B | 1 mm | p. 40 |
| 15 LD 225 | ||
| Standard oil sump capacity (filter included) | 0.9L | p. 19 |
| 15 LD 315, 15 LD 350 | ||
| Standard oil sump capacity (filter included) | 1.2L | p. 19 |
| 15 LD 400, 15 LD 440 | ||
| Standard oil sump capacity (filter included) | 1.5L | p. 19 |
Lombardini 15 LD 225–440 Common Problems This Manual Covers
Lombardini 15 LD 225 to 440 oil pump and pressure valve suspect with too low oil pressure
Measure the oil pump rotor clearance on page 48. The maximum is 0.13 mm, and the pump must be replaced once it reaches the 0.25 mm wear limit. Inspect the oil pressure regulation valve and clean the internal strainer. After reassembly, run the oil pressure check to confirm the fix.
Manual Section: Lubrication System p. 48Fuel filter and feed pump suspect when the engine starts but stops
Inspect the fuel filter. Make sure the replacement filters to 7 µm or finer and has at least 390 cm² of filtering area. Check feed pump delivery against 40 l/h on page 52, and torque the feed pump screws to 15 Nm. Then go through the fuel circuit causes listed in the troubleshooting chart.
Manual Section: Fuel System p. 52Injector calibration and injection timing check for black smoke or white smoke at the exhaust
Start with the fuel circuit causes for black or white smoke in the troubleshooting chart on page 7. Pull the injector, check its calibration on the tester, and set static injection timing by the Fuel System procedure. Refit the injector and torque the ring nut to 50 Nm per page 58.
Manual Section: Fuel System p. 58Idle and full speed settings suspect when engine runs at non-uniform speed with no acceleration
Check the causes listed for non-uniform speed and no acceleration in the troubleshooting chart on page 7. Adjust idle speed and the full speed setting in no-load conditions following page 67. Verify the injection pump flow rate and delivery limiting before you open the engine to look for internal wear.
Manual Section: Settings Adjustements p. 67Starter motor spacing to flywheel rim suspect when the electric start engine does not start
Go through the electric system causes for no start in the troubleshooting chart on page 7. Then measure from the flywheel rim surface to the starter motor flange surface on page 65; the distance must be 17.5 to 19.5 mm. Compare the starting motor characteristics and the wiring against the diagrams on page 61.
Manual Section: Electrical System p. 6512V electric start alternator and voltage regulator suspect with the battery not recharging after running
Test the voltage regulator using the procedure in the Electrical System section. Trace the charging circuit against the wiring diagrams on page 61, making sure you follow the layout for your 12V or 24V setup. Verify that the alternator is recharging the battery before you replace the regulator.
Manual Section: Electrical System p. 61Frequently Asked Questions
What are the fuel filter replacement specs for the Lombardini 15 LD 225, 15 LD 315, 15 LD 350, 15 LD 400, 15 LD 440?
The fuel filter replacement frequency is specified in the maintenance table on page 18. For the version with an internal filter, the components include a filter cartridge (p.no. 4) and filter sleeve (p.no. 3). For the version with an external filter, the filtering area is at least 390 cm² with a paper porosity of 7 µm or less. p. 25
What are the air filter element replacement specs for the Lombardini 15 LD engines?
For 15LD 315 and 350 engines, the dry air cleaner cartridge has a media porosity of 7 µm and a useful filtering area of 1960 cm². The polyurethane pre-filter has a porosity of 60 p.p.i. and can be washed up to 10 times. For 15LD 225 engines, the paper porosity is 3 µm with a filtering area of 4400 cm². p. 20
What is the correct cylinder head tightening procedure for the 15 LD 400 and 440 engines?
The cylinder head bolts must be tightened in six phases: first, tighten all screws crosswise to 20 Nm, then to 40 Nm, and finally to 50 Nm. In the fourth and fifth phases, rotate the screws by 60 degrees following the same order. Finally, tighten the two side screws (5) to 10 Nm. p. 27
What is the valve/rocker arm clearance for 15 LD 225, 315, and 350 engines?
The valve/rocker arm clearance for these engines should be set when the engine is cold. Bring the piston to top dead center on the compression stroke and set the clearance to 0.10-0.15 mm using a thickness gauge, then tighten the lock nut. p. 23
What is the oil capacity for the 15 LD 400 and 440 engines?
The standard oil sump capacity for the 15 LD 400 and 440 engines is 1.5 liters, including the oil filter. p. 19
Is this Lombardini 15 LD 225 Shop Manual a digital download?
One searchable PDF covering 74 pages, delivered instantly. No disc, no shipping, no waiting on the post.
Are there any print restrictions on this Lombardini 15 LD 225 manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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