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Adjustable valve clearance 2-cylinder diesel engine - Lombordini

sebastian1260 56553 19
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How do I set valve clearance on a 2-cylinder Lombardini diesel engine, which cylinder should I adjust first, and does the same clearance apply to both intake and exhaust valves?

You can adjust either cylinder first: set one chosen cylinder at TDC (gmp) with both cams positioned so neither valve is being opened, adjust its clearance, then rotate the crankshaft 180° and adjust the second cylinder [#16652484] The specified valve clearance is the same for both intake and exhaust valves [#16652484] If you are choosing between 0.15 mm and 0.20 mm, the 0.05 mm difference will probably not matter much, and for a heavily loaded engine a slightly larger clearance is acceptable [#16655761]
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  • #1 16645589
    sebastian1260
    Level 6  
    Posts: 109
    Help: 1
    Rate: 41
    Hello
    I have to adjust valve clearance in the Lambordini engine. I have manual service for this unit. Generally everything is given what and how but I have some questions.
    Which cylinder is marked first on the signs? The first one will be the timing?
    How can I set the camshaft on the basis of the characters in the correct position for adjustment, since 1 revolution of the camshaft is per 1 revolution of the crankshaft? You can set the shaft on one of the characters and check on which cylinder the cams are at the bottom (do not support the valve) and on this mark you can regulate this cylinder?
    And one more in the specification I have given only one valve clearance value, i.e. this value applies to both intake and exhaust valves?
    I am enclosing a manual regarding adjustment of valve clearance in this engine.
    I would be very grateful for your help. Adjustable valve clearance 2-cylinder diesel engine - Lombordini Adjustable valve clearance 2-cylinder diesel engine - Lombordini Adjustable valve clearance 2-cylinder diesel engine - Lombordini Adjustable valve clearance 2-cylinder diesel engine - Lombordini
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    #2 16652484
    Orochimaru
    Level 31  
    Posts: 1198
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    The manual is written to set any chosen cylinder in gmp. You will know which one, because - as you mentioned - the cams of the cylinder of this cylinder will be in such a position that no valve above it will open. Adjust the play, rotate the crankshaft 180 ° and adjust the play on the second cylinder. The clearance value is the same for both valves.
  • #3 16653323
    sebastian1260
    Level 6  
    Posts: 109
    Help: 1
    Rate: 41
    Thank you for your help. Tell me whether the order in which the valve cover bolts are tightened, shown in the drawing in the appendix, will be appropriate? There is no order anywhere, I know that you have to tighten from the inside and then cross. Regarding the valve clearance, the specification gives 0.20 mm and on the motor sticker I have given 0.15 Adjustable valve clearance 2-cylinder diesel engine - Lombordini mm what to take into account?
  • #4 16654504
    jarekstryszawa
    Level 23  
    Posts: 1052
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    Please correct the title of the topic, these engines are Lombardini, not Lambordini.
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    #5 16655761
    Orochimaru
    Level 31  
    Posts: 1198
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    The order can be.
    0.05mm probably will not make a big difference. If the motor is heavily loaded, give a little more clearance.
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  • #6 16655885
    sebastian1260
    Level 6  
    Posts: 109
    Help: 1
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    And if I need to decorate the fuel rail visible on the first picture added (screwed on 4 screws) Should I pay attention to something during the assembly / disassembly, if I take off the cover, I tighten it properly and all this? I know that you need to replace 4 rings when you put it on, and I will. I have to take it off because I will replace the seal at the entrance of this rail. Is it possible to turn it all "on the eye" or rather it would be worth to buy a torque wrench to be sure that nothing will sweat, etc. I know where this difference in terms of valve clearance Lombordini gives 0.15mm but this engine is used in a quad and the manufacturer gives a clearance of 0.20 due to heavy engine loads.
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  • #7 16657693
    Orochimaru
    Level 31  
    Posts: 1198
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    If you do not have a torque wrench, you can easily take it easy. Just try to make them all tightened with more or less the same strength. You can spin on a few times: first all with a screwdriver, then lightly with a wrench, then a bit harder with the key and so, until you feel that for this size of screws enough :)
    Probably you will tighten it more tightly than you need (usually it tightens before you buy a key).
  • #8 16657965
    sebastian1260
    Level 6  
    Posts: 109
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    I also screw the fuel rail normally on new O-rings, then with a manual pump, pump the fuel out of the system and all this way?
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    #9 16659755
    Orochimaru
    Level 31  
    Posts: 1198
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    Yes. It may not fire the first time until it pushes the fuel through the injections.
  • #10 16659935
    sebastian1260
    Level 6  
    Posts: 109
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    Rate: 41
    Thank you very much for your help. Really, your tips are very valuable to me.
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  • #11 17284111
    Jozef Drozdz
    Level 1  
    Posts: 1
    Rate: 13
    Hello, please help
    The ldd 502 lombardini engine with what force to tighten the head pins. Thank you in advance for your answer
    Regards, Josef
  • #12 17284333
    carrot
    Moderator of Cars  
    Posts: 8381
    Help: 1306
    Rate: 3544
    You have a manual for this engine
    Attachments:
    • 1_5302_727_MO_502_GB.pdf (9.83 MB) You must be logged in to download this attachment.
  • #13 17340898
    drajwer12
    Level 10  
    Posts: 11
    Rate: 18
    Hello, the topic a bit about regulation, namely, I made a gasket under the head and I started the car, it's ok, I'm not screwed in, please help. I do not know if I have put those gas pipes in good condition, this spring means. I zapped her where she was. please help
  • #14 17341081
    sebastian1260
    Level 6  
    Posts: 109
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    @ drajwer12

    Do you mean the Lombardini engine?
  • #15 17341216
    drajwer12
    Level 10  
    Posts: 11
    Rate: 18
    This is how the lombardini engine ldw502 exactly. As you know in the subject, you can contact a tel

    Added after 14 [hours] 54 [minutes]:

    Everything ok I have already arrived, it was necessary to move the pull rod on the pump injections to the maximum right
  • #16 17455170
    Adoom72
    Level 10  
    Posts: 17
    Rate: 13
    Good morning ,
    Does anyone have a schematic of this engine because I am looking for glow plugs for replacement? (Lombordini 502 Focs disel grecav)
    Can someone help me where the candles are, are there two or more?
    Please, send an email to adamglo(_at_)tlen.pl?
    Regards and I will be very grateful :)
  • #17 17459985
    sebastian1260
    Level 6  
    Posts: 109
    Help: 1
    Rate: 41
    Ask the Lombardini service for a catalog of parts for your engine. They easily emailed such a catalog to LDW 702. In LDW 702, glow plugs are located under the intake manifold at 502 probably the same.
  • #18 19655148
    raf137pl
    Level 2  
    Posts: 2
    Rate: 4
    Hello, I have a question about these engines whether the injection pump fits from one model to another
  • #19 20702086
    wita5742
    Level 1  
    Posts: 1
    Rate: 20

    And I have a question: how to set up the pump injection well? Because the cold one will start, and the warm one needs to be turned on for a long time.
  • #20 21602284
    benek55551
    Level 5  
    Posts: 4
    Do you happen to know how to set the Microcar Virgo's free revs on the pump-injectors?
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Topic summary

✨ The discussion revolves around adjusting the valve clearance in a Lombardini 2-cylinder diesel engine. The user seeks clarification on identifying the first cylinder for adjustment, the correct positioning of the camshaft, and whether the specified valve clearance value applies to both intake and exhaust valves. Responses indicate that the manual provides guidance for setting any cylinder at the top dead center (TDC) where no valves are open. The user is advised to adjust the first cylinder, rotate the crankshaft 180 degrees, and then adjust the second cylinder. The specified clearance values of 0.20 mm and 0.15 mm are discussed, with suggestions to use the higher value for heavily loaded engines. Additional queries about tightening the valve cover bolts and assembling the fuel rail are addressed, emphasizing the importance of even tightening and the potential need for a torque wrench. The discussion also touches on related topics such as glow plug replacement and injection pump adjustments.
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FAQ

TL;DR: For Lombardini LDW/LDW502 valve set-up, bring one cylinder to TDC, adjust, then "rotate the crankshaft 180°" and set the other; both valves use the same clearance. [Elektroda, Orochimaru, post #16652484]

Why it matters: This FAQ helps DIYers fix hard-start, rough-idle, and valve-noise issues on 2‑cyl Lombardini diesels fast.

Quick Facts

Which cylinder is “first” when adjusting valves on a Lombardini 2‑cyl?

Either cylinder can be first. Set a cylinder at TDC on compression so both valves are closed, adjust, then rotate the crankshaft 180° and adjust the second cylinder. “The clearance value is the same for both valves.” [Elektroda, Orochimaru, post #16652484]

How do I find TDC (Top Dead Center) for adjustment on this engine?

Turn the crank until the chosen cylinder’s cam lobes point away from the rockers so no valve opens. That indicates TDC compression for that cylinder. Adjust there, then rotate 180° to set the other cylinder. [Elektroda, Orochimaru, post #16652484]

What valve clearance should I use—0.15 mm or 0.20 mm?

Use the value specified for your application. Owners report 0.15 mm as the Lombardini spec, and 0.20 mm where the engine sees heavier loads, such as quads. [Elektroda, sebastian1260, post #16655885]

Is the clearance the same for intake and exhaust valves?

Yes. Community guidance for this engine notes the same clearance for both intake and exhaust valves during adjustment. [Elektroda, Orochimaru, post #16652484]

What bolt‑tightening order should I follow for the valve cover?

Tighten from the center outward in a cross pattern. The order shown by the user is acceptable and matches common practice on these covers. [Elektroda, Orochimaru, post #16655761]

Do I need a torque wrench for the fuel rail/cover reassembly?

A torque wrench is best, but users report success tightening evenly in stages by hand. Work all fasteners progressively to equal feel to avoid leaks or distortion. [Elektroda, Orochimaru, post #16657693]

How do I bleed the system after removing the fuel rail?

Reassemble with new O‑rings, then prime using a manual pump. Expect extended cranking on first start as fuel purges through the injectors. [Elektroda, Orochimaru, post #16659755]

How many O‑rings are on the fuel rail, and should I replace them?

There are four O‑rings on the rail in the discussed setup. Replace all four during reassembly to minimize seepage and air ingress. [Elektroda, sebastian1260, post #16655885]

Where are the glow plugs on LDW engines like 502/702?

On LDW702 they sit under the intake manifold; owners suggest LDW502 is similar. Remove the intake to access and replace the plugs. [Elektroda, sebastian1260, post #17459985]

My Lombardini starts cold but cranks long when warm. How can I set the injection pump?

Verify the pump control linkage. One owner restored proper starting by moving the pull rod on the injection pump to the maximum right position. Adjust carefully and test. [Elektroda, drajwer12, post #17341216]

Do injection pumps interchange between Lombardini models?

Compatibility varies. Confirm by cross‑checking the official parts catalog for your exact engine code before swapping components. [Elektroda, sebastian1260, post #17459985]

What torque should I use for LDD/LDW502 cylinder head bolts?

Consult the factory service manual for your specific variant. Community responses direct owners to the official manual for head bolt torque and sequence. [Elektroda, carrot, post #17284333]

What does TDC mean, in simple terms?

TDC, or Top Dead Center, is when the piston reaches the highest point in the cylinder. For valve setting, use TDC on the compression stroke when both valves are closed. [Elektroda, Orochimaru, post #16652484]

Is a 0.05 mm difference in clearance a big deal?

Users report 0.05 mm difference as not critical. For engines under heavy load, choose the slightly larger end of the typical range. [Elektroda, Orochimaru, post #16655761]

How do I set valve clearance on a Lombardini twin—quick steps?

  1. Set Cylinder A at TDC compression (both valves closed) and adjust its clearance.
  2. Rotate the crankshaft 180°.
  3. Set Cylinder B at TDC compression and adjust its clearance. [Elektroda, Orochimaru, post #16652484]

After reassembly, it still won’t fire—what’s an edge case to check?

Air in lines after opening the fuel system can delay firing. Keep priming and cranking; first ignition may take several attempts. [Elektroda, Orochimaru, post #16659755]
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