1542078 Nut/Connecting Rod Bolt | Genuine Volvo Penta Part

🔧 Product Description

This is a genuine Volvo Penta connecting rod bolt nut from the engine group, used to secure the connecting rod big-end cap to the rod on MD, TMD, TAMD, AD, AQAD, KAD and KAMD series marine diesel engines. It is a single fastener with a net weight of approximately 0.014 kg and is normally replaced as a matter of course whenever a big-end cap has been removed. Correct clamping of the rod cap is critical to bearing alignment, so a fresh nut is recommended at every rebuild.

🚤 Compatibility

• Engine Family: MD, TMD, AD, TAMD, AQAD, D, TD, DP, DPX, SP, AQD, KAMD, KAD
• Year Range: Approximately late 1970s-2000s, engine and rod revision controlled

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 1542078
• System group: Engine
• Net weight approximately 0.014 kg
• Connecting rod bolt nut for big-end cap fastening
• Fits MD, TMD, TAMD, AD, AQAD, KAD and KAMD 30/31/40/41/42/43/44 series marine diesel engines
• Also listed for SP and DP series sterndrive applications
• Engine type: Volvo Penta four- and six-cylinder marine diesel

🔌 Function

The nut secures the connecting rod bolt, clamping the big-end cap to the connecting rod so the crankshaft bearing shells are held in correct alignment and preload. It maintains the clamping force that keeps the rod assembly together under combustion and inertia loads.

⚠️ Common Signs of Failure

• Stretched, distorted or damaged threads after removal or over-torquing
• Inability to hold specified torque during assembly
• Knocking or rumbling from the lower end indicating a loose big-end cap
• Corrosion, pitting or galling on the thread and seating face
• Visible cracking or deformation of the nut body

🛠️ Service Notes

• This nut is normally renewed as a pair with its bolt whenever a big-end cap is removed — reusing the old nut on a new bolt (or the reverse) risks an incorrect clamp even at the correct torque figure, because the thread condition of the pair is what was matched originally.
• At 0.014 kg it is small enough to be lost among other engine nuts in a parts tray — keep it segregated with its bolt and cap through a rebuild so it isn't picked up for a different, lower-stressed joint.

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 1542077 matching connecting-rod bolt
• 1542072 related connecting rod
• 3581063 related connecting rod
• 1542076 related connecting-rod bushing
• 3581021 related connecting-rod bushing
• 861499 related complete connecting-rod bolt-set reference
• 876511 related big-end bearing kits
• 876512 related big-end bearing kits
• 876513 related big-end bearing kits
• 876514 related big-end bearing kits

Aftermarket / Verified Equivalents

• Orbitrade: 12078
• Olsson Parts: 120472 connecting-rod bolt and nut set
• Orbitrade / SLP complete connecting-rod bolt set replacing 1542077, 1542078 and 861499

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta AD41P-B, AD41B, AD41D, AD41L-A, AD41P-A, AD41, AD41A, AD41BJ
• Volvo Penta TAMD31L-A, TAMD31M-A, TAMD31P, TAMD31P-A, TAMD31S, TAMD31A, TAMD31B, TAMD31D
• Volvo Penta TAMD41B, TAMD41D, TAMD41H-A, TAMD41H-B, TAMD41M-A, TAMD41P-A, TAMD41A
• Volvo Penta AD31, AD31B, AD31D-A, AD31L-A, AD31P-A, AD31XD
• Volvo Penta D41, D41B, D41D, D41L-A
• Volvo Penta DP-A, DP-A1, DP-B, DP-B1
• Volvo Penta TMD31A, TMD31B, TMD31D, TMD31L-A
• Volvo Penta TMD41A, TMD41B, TMD41D, TMD41L-A
• Volvo Penta KAD42A, KAD42B, KAD42P-A
• Volvo Penta KAD44P, KAD44P-B, KAD44P-C
• Volvo Penta KAMD42A, KAMD42B, KAMD42P-A
• Volvo Penta KAMD43P, KAMD43P-A, KAMD43P-B
• Volvo Penta KAMD44P-B, KAMD44P-C, KAMD44P-A
• Volvo Penta TMD40A, TMD40B, TMD40C
• Volvo Penta AQAD40B, AQAD40A
• Volvo Penta 740A, 290A
• Volvo Penta SP-A, SP-A1
• Volvo Penta TAMD40A, TAMD40B
• Volvo Penta TAMD42WJ-A, TAMD42B
• Volvo Penta AQAD30A
• Volvo Penta AQD40A
• Volvo Penta DPX
• Volvo Penta KAD300-A
• Volvo Penta KAD32P
• Volvo Penta KAD43P-A
• Volvo Penta KAMD300-A
• Volvo Penta MD30A
• Volvo Penta MD31A
• Volvo Penta MD40A
• Volvo Penta TAMD30A
• Volvo Penta TD30A
• Volvo Penta TD31ACE
• Volvo Penta TD40A
• Volvo Penta TMD30A