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Mid - Late Model Style Bolts with 12 point heads.
**BOLTS ARE SOLD INDIVIDUALLY**
Two different connecting rod and cap mating surface finishes were used and identification can be made by visual inspection. Early style connecting rods have a serrated mating surface between the cap and the rod. Middle and Late style connecting rods can be identified by smooth/machined surfaces between the cap and the rod.
Allis-Chalmers engine models: 2000 series, 3.3 and 4.9-liter series (2200, 2800, 2900, 433 & 649 types, etc.)
Allis-Chalmers engine models: 3000 Series, 7.0 liter series (3400, 3500, 3700, 3750 & 670 types, etc.)
ALL MODELS
When installing, use a light amount of engine oil on capscrew threads and on the underside of the capscrew head at the mating surface. Tighten hardware using a minimum of two incremental torque steps, three on higher torque hardware (7.0L). Non-serrated connecting rod caps MUST be aligned with the rod during installation. To do so, install hardware finger tight, use two feeler gauges between the rod/cap assembly and the side of journal to hold assembly snug to one side of journal. Tighten hardware in multiple steps and then remove feeler gauges.
Note: Do not use 12 point (mid - late) type hardware in early-serrated connecting rods with chamfered holes. Loosening of capscrews will occur. Early rods may be machined and balanced to accept later capscrews.
Allis 265 gas
Allis Chalmers 180, 190 gas
Allis 301 gas
Allis Chalmers 190XT gas
Allis 433 Diesel
Allis Chalmers 6060, 6070, 6080
Allis Chalmers Industrial HD4 Diesel
Allis 649 Diesel
Allis Chalmers 180, 185, 190, 190XT Diesel
Allis Chalmers 200, 7000, 7010, 7020, 8010
Allis Chalmers Industrial TL345B, TL545, W, 545
Allis 670 Diesel
Allis Chalmers D21, 210, 220, 7030, 7040, 7050, 7060
see AC001-TB tech. bulletin
Price is per Bolt
OEM Part Number Cross Reference(s): 74024583, 4024583, 74020142
**BOLTS ARE SOLD INDIVIDUALLY**
Two different connecting rod and cap mating surface finishes were used and identification can be made by visual inspection. Early style connecting rods have a serrated mating surface between the cap and the rod. Middle and Late style connecting rods can be identified by smooth/machined surfaces between the cap and the rod.
Allis-Chalmers engine models: 2000 series, 3.3 and 4.9-liter series (2200, 2800, 2900, 433 & 649 types, etc.)
- Early style rods use hex-head capscrew with washer. The rod cap bolt holes have a 30 degree chamfer. Capscrew size used is .375" 24 x 2.00" long, grade 8, tighten those capscrews to 50 ft/lbs.
- Later style rods have the rod cap chamfer deleted and a new 12-point capscrew introduced. Capscrew size used is .375" - 24 x 2.00" long, grade 100, tighten those capscrews to 45 ft/lbs.
Allis-Chalmers engine models: 3000 Series, 7.0 liter series (3400, 3500, 3700, 3750 & 670 types, etc.)
- Early style rods use serrated rod caps with hexhead capscrews and washers. Capscrew size .437" 20 x 2.25" grade 8, tighten those capscrews to 85 ft/lbs.
- Middle style rods use smooth machined rod and cap mating surfaces. Socket head capscrew size .437" 20 x 2.156" long, grade 100, tighten those capscrews to 70 ft/lbs.
- Later style rods use smooth machined rod and cap mating surfaces. 12-point capscrew size .437" 20 x 2.156" long, grade 100, tighten those capscrews to 70 ft/lbs
ALL MODELS
When installing, use a light amount of engine oil on capscrew threads and on the underside of the capscrew head at the mating surface. Tighten hardware using a minimum of two incremental torque steps, three on higher torque hardware (7.0L). Non-serrated connecting rod caps MUST be aligned with the rod during installation. To do so, install hardware finger tight, use two feeler gauges between the rod/cap assembly and the side of journal to hold assembly snug to one side of journal. Tighten hardware in multiple steps and then remove feeler gauges.
Note: Do not use 12 point (mid - late) type hardware in early-serrated connecting rods with chamfered holes. Loosening of capscrews will occur. Early rods may be machined and balanced to accept later capscrews.
Allis 265 gas
Allis Chalmers 180, 190 gas
Allis 301 gas
Allis Chalmers 190XT gas
Allis 433 Diesel
Allis Chalmers 6060, 6070, 6080
Allis Chalmers Industrial HD4 Diesel
Allis 649 Diesel
Allis Chalmers 180, 185, 190, 190XT Diesel
Allis Chalmers 200, 7000, 7010, 7020, 8010
Allis Chalmers Industrial TL345B, TL545, W, 545
Allis 670 Diesel
Allis Chalmers D21, 210, 220, 7030, 7040, 7050, 7060
see AC001-TB tech. bulletin
Price is per Bolt
OEM Part Number Cross Reference(s): 74024583, 4024583, 74020142
Warranty Information
Overview
We stand behind every part we sell — new, rebuilt, or used. While RF Engine is not the manufacturer and cannot extend additional warranties, we do guarantee that each product will arrive as described, in usable condition, and free from material defects or misrepresentation.
Warranty Coverage
- New Parts: Covered under the original manufacturer’s warranty. All terms and coverage are set by the manufacturer. Copies available upon request.
- Rebuilt, Reconditioned, and Used Parts: Backed by an inspection-only warranty unless otherwise stated. As with new parts, RF Engine cannot provide further warranty coverage beyond the manufacturer’s terms.
- No Additional Warranty: RF Engine does not offer any express or implied warranties. However, if an issue arises, we are here to assist and will support you through any applicable manufacturer claim process.
Our Guarantee
All parts are guaranteed to be in the condition stated at the time of sale and free from misrepresentation. If something isn’t right, we’ll work with you to resolve it — including returns, exchanges, or refunds when appropriate.
- We sell parts — we don’t make them — but we stand behind what we sell.
- Guaranteed to match the description or your money back.
- Manufacturer’s warranty applies where available; we’ll help if you ever need it.
Used Parts — What to Expect
Used parts are cleaned, inspected, and guaranteed to be usable, but please note:
- They often have signs of wear, surface rust, blemishes, or cosmetic imperfections.
- They may include old gaskets or residue and likely require further cleaning or machining before installation.
- They are not refurbished, remanufactured, or restored to like-new appearance.
We recommend careful inspection and strongly encourage installation by a qualified heavy-duty diesel mechanic.
- Worn, not worn out — used parts may show signs of age but are fit for service.
- All used parts are tested for usability, not appearance.
Questions?
If you have questions about a part’s condition, warranty, or how we handle returns and guarantees, feel free to contact us. We’re here to help.
Last Updated: June 22, 2025
All specifications and numbers are provided for reference only and should be independently verified before use. While we guarantee our parts match their descriptions and accept returns for any discrepancies, we cannot be held liable for installation costs, modifications, or consequential damages. Questions about compatibility? Contact our parts experts at 800-828-6943, sales@dieselcranks.com, or via live chat, Mon-Fri 8am-5pm EST.
