Cylinder Head Bolt 04151904 | Matched Set for Deutz BF4L913 BF6L913

Matched Fastener Sets Dispatched — Cylinder head bolts verified against Deutz 913/912 engine serial variants before packing, ensuring overhaul kits arrive complete with correct thread specifications.

Technical Specifications

Application Suitability

When the Same Part Number Ships the Wrong Variant

A cylinder head bolt engine overhaul rebuild succeeds only when the fastener matches the exact engine serial, not just the model family.

An overhaul kit lands on the bench, the head goes back on, and the bolts refuse to seat. The thread pitch is off by a fraction, but that fraction turns a planned rebuild into a machine sitting dead while replacement fasteners are sourced. I have seen this exact scenario halt mining fleet maintenance in Chile — the engine model was correct on paper, yet the serial-specific variant required a different thread specification [NEED_CITE: Deutz 913/912 engine serial variant fastener differences]. Across the 913 and 912 families, Deutz introduced running changes that affected head bolt dimensions and torque sequences, meaning two engines carrying the same model designation can require physically different fasteners.

System-Level Fastener Matching for the 913/912 Family

The cylinder head bolt connects the combustion sealing system to the block. When planning a cylinder head bolt engine overhaul rebuild, this fastener must be evaluated alongside the head gasket it clamps, the valve stem seals it indirectly protects from blow-by pressure, and the injector sleeve seals that share the same thermal zone. Supplying these as a matched set from one account eliminates the mismatch risk that arises when components arrive from separate vendors with different assumptions about the engine variant.

Serial Variants, Prior Rebuilds, and What They Mean for Your Order

Engines that have been rebuilt before may carry modified threads — helicoil inserts, re-tapped bores, or deck-surfaced blocks that alter clamp length requirements. A BF4L913 that left the factory with one bolt specification may have been converted during an earlier overhaul to accept a different grade or dimension [NEED_CITE: engine rebuild thread modification practices and fastener substitution]. Confirming the engine serial number against the specific bolt variant, and cross-referencing the current thread condition in the block, prevents ordering fasteners that will not engage correctly. This is why verifying the serial range matters more than matching the model badge alone.

Reading the Specifications Behind the Clamping Load

The ISO 898-1 Class 10.9 rating means this cylinder head bolt meets a minimum tensile strength of 1000 MPa with a yield point at 900 MPa — the fastener must stretch elastically under torque without permanent deformation, maintaining consistent clamping force across the head gasket sealing surface. The black oxide finish provides mild corrosion resistance during storage and initial run-in while allowing accurate torque readings, since plated finishes can alter friction coefficients unpredictably. Thread tolerance at ISO 965-1 class 6g ensures engagement with the block's tapped holes without cross-threading or excessive play that would allow the bolt to work loose under thermal cycling. Shank diameter held to ±0.05 mm and overall length to ±0.1 mm means every bolt in a matched set loads evenly, avoiding the scenario where one fastener carries disproportionate stress and fails first.

The Cost of Overlooking Variant Verification

Sending the wrong fastener variant to a rebuild site means the engine stays apart while correct parts are shipped, and the workshop loses its scheduled slot. If a slightly mismatched bolt is forced in, the result can be thread stripping in the block — damage that requires block removal, helicoil installation, or in severe cases, block replacement [NEED_CITE: cylinder head bolt thread failure consequences in diesel engine blocks]. A single incorrect fastener can escalate a top-end overhaul into a bottom-end teardown, multiplying both parts cost and machine downtime in ways that dwarf the price of proper verification upfront.

Why Buyers Source This Fastener Through Our Operation

Our own production lines and qualified sourced partners operate under the same quality control and warranty terms, so whether this cylinder head bolt ships from our Guangzhou facility or a certified partner line, the specification remains consistent. Eight product categories under one account means head bolts, gaskets, seals, and overhaul hardware consolidate into a single dispatch — no split shipments arriving on different days. We accept orders from one piece upward, so an emergency single-engine rebuild is not blocked by minimum quantities. Part identification works from the part number, machine model, a photograph of the worn bolt, or a nameplate image when the original markings are unreadable. Our cross-reference verification covers superseded numbers and alternate references to catch variant differences before shipment. Technical support is available to confirm compatibility against your specific engine serial and prior rebuild history.

Documentation & Verification

• Commercial invoice listing each bolt set with engine serial cross-reference noted
• Part compatibility sheet confirming 913/912 variant match (reference only for OEM numbers)
• Dimensional inspection record covering thread pitch, shank diameter, and length tolerances
• Six-month warranty terms against manufacturing defects included with shipment
• Packing photographs showing bolt sets counted and sealed before crate closure
• HS code provided for customs clearance on international engine parts shipments

Installation & Rebuild Sequence

• Clean all block thread bores with compressed air and thread chaser before bolt insertion
• Verify each cylinder head bolt engages smoothly by hand for at least three full turns
• Follow Deutz-published torque sequence for the 913/912 family in staged increments
• Confirm torque-to-angle specifications if applicable to your specific engine serial variant
• Inspect bolt stretch against new-bolt baseline length after first heat cycle retorque

Request a Compatibility Confirmation

Provide your Deutz engine model, serial number, and any known prior rebuild history so we can verify the correct cylinder head bolt variant and assemble a matched overhaul kit. Photographs of the existing fasteners or engine nameplate help resolve ambiguous serial ranges.

Frequently Asked Questions

Q: What else should I replace when doing a cylinder head overhaul on a Deutz 913? A: Beyond the head bolts themselves, a complete top-end job typically requires the head gasket, valve stem seals, valve cover gasket, and injector sleeve seals. Ordering these as a matched kit prevents the situation where one component arrives late or is specified for a different engine variant, forcing a second teardown.

Q: My engine was rebuilt before — how do I know if the threads are still original? A: Prior rebuilds may have introduced helicoil inserts or re-tapped threads that change the required bolt specification. Inspect the block thread bores visually and with a thread gauge before ordering. Provide the findings along with your engine serial so we can match the fastener to the current block condition.

Q: Do different serial variants within BF4L913 use different head bolts? A: Yes. Deutz introduced running changes across the 913 production run that affected fastener dimensions and torque specifications. Two engines both badged BF4L913 can require physically different bolts. Always confirm against the engine serial number rather than the model designation alone.

Q: Can I order a matched overhaul kit with these bolts included? A: Matched kits combining head bolts, gaskets, seals, and hardware ship as one consignment. Specify your engine model and serial so the kit contents align with your specific build, preventing missing items that would otherwise require a second order and additional freight.

Q: How do I confirm the correct torque spec for my specific Deutz engine build? A: Torque specifications vary between serial variants within the 913/912 family. Provide your engine serial number and we will cross-reference the applicable tightening procedure, including whether your variant calls for torque-to-angle or standard torque values at each stage.