Description
1S1970 Chamber A Fits Caterpillar Models. 1S1970, 1S-1970. The precombustion chamber is the cavity in the cylinder head where fuel is initially ignited before combustion spreads to the main cylinder. Caterpillar Engine Applications: D311, D315, D318, D318G. Reliable Aftermarket Parts Michigan, USA Ships Within 24–48 Business Hours Questions? Contact Us Visit Store About Us Contact Us 1S1970 Chamber A Fits Caterpillar Models New Part 6-Month Warranty Free Shipping* 30-Day Returns Part Details Condition New Aftermarket Warranty 6 Months Ships From Michigan, USA Description One New Aftermarket Replacement Precombustion Chamber (Chamber A) for Caterpillar (Cat) Engines This aftermarket replacement precombustion chamber (pre-cup) fits Caterpillar D311, D315, D318, and D318G indirect-injection diesel engines. The precombustion chamber is the cavity in the cylinder head where fuel is initially ignited before combustion spreads to the main cylinder. During operation, these chambers endure extreme compression forces and heat cycles; over time they can crack or work loose, risking serious damage to the cylinder head or engine block. Replacing a worn or damaged chamber restores proper combustion efficiency and protects the surrounding assembly. Specifications Diameter: 55mm Compatible glow plug: 3H2033 (pencil-type) Associated hardware: outer O-ring seal 2H3088, injector retainer nut 6F8061, O-ring seals 5B3718 (sold separately) Compatible Engines / Models Caterpillar Engine Applications: D311, D315, D318, D318G Caterpillar Equipment (D6 series and others powered by the above engines): Verify your engine model number before ordering. Note: ACMOC forum sources reference a chamber size change on the D6 9U series at serial number 9U11705 -- confirm fitment for D6 9U machines near or above that serial break. Replaces Part Number(s): 1S1970, 1S-1970 Aftermarket Interchange Numbers 2S1273, 2S-1273, 4F8517, 4F-8517 New aftermarket replacement part - not remanufactured, not used. About Us Return Policy Shipping FAQ About Reliable Aftermarket Parts Reliable Aftermarket Parts is your trusted source for high-quality replacement parts covering a wide range of outdoor and heavy equipment. We specialize in parts for Lawn & Garden, Snow Removal, UTV, ATV, and Golf Cart machinery, as well as Backhoes, Crawlers, Excavators, Tractors, Skid Steers, and more — covering most leading brands and models in the industry. Customer satisfaction is our top priority. Our team is here to help you find the right part and get your equipment back up and running. Call us toll-free at 1-888-6PARTS6 (1-888-672-7876) or directly at 517-347-7033. Add us to your favorite sellers list and make us your go-to source for reliable replacement parts. Return Policy We provide a 30-day return policy. If the part doesn't fit, you don't like it, or it is unused, we'll take it back and refund your money. Please note: This policy does not apply to glass or seat orders. Those items may only be returned if damaged on delivery or if the wrong item was shipped. Glass and seat orders carry a limited 15-day return policy. No returns on glass will be accepted without photo evidence of damage. In the event of damage, shortage, or a shipping error, contact us immediately at 888-672-7876. Please save all original packaging. A restocking fee may apply. Refer to the eBay Return Policy for more details. You are covered by the eBay Money Back Guarantee if you receive an item not as described. Shipping Information How long does it take to ship? Orders ship within 24–48 business hours on average. Orders placed before 1:00 PM EST typically ship the same day. How long until delivery? Most orders are delivered within 3–7 business days depending on location, weather, and the items ordered. We provide free shipping within the contiguous 48 United States (qualifying orders only; does not apply to LTL freight shipments). Have questions before you order? Call us at 888-672-7876 — we're happy to help. Frequently Asked Questions How do I know my order was placed successfully? After checkout, you'll receive a confirmation email. For any order questions, call us at 888-672-7876. Can I return a part that doesn't fit or that I no longer need? Yes — we offer a 30-day return policy on most items. If it doesn't fit, isn't what you expected, or is unused, we'll take it back and refund you. See our Return Policy tab for full details and exceptions. How quickly will my order ship? Orders ship within 24–48 business hours. Same-day shipping is typical for orders placed before 1:00 PM EST. Do you offer free shipping? Yes — free shipping is available within the contiguous 48 United States on qualifying orders. LTL freight shipments are excluded. Call us at 888-672-7876 for details on large or heavy items. Shop By Category Agriculture John Deere, Allis Chalmers, Ford/New Holland, Case, Massey Ferguson & More Shop Now Construction Allis Chalmers, International Harvester, Caterpillar, Komatsu & More Shop Now Lawn & Garden Bad Boy, Briggs & Stratton, Cub Cadet, Honda, Sears, Snapper & More Shop Now Snow Removal Ariens, Briggs & Stratton, Jacobsen, Toro, Troy-Bilt, Sears & More Shop Now 30-Day Returns Parts that don't fit come back quickly and easily within 30 days of purchase. Free Shipping* Free shipping to the contiguous 48 states on qualifying orders. LTL excluded. Expert Service Expertly trained staff ready to help you track down the right part every time. Visit Store Contact Us About Us © 2026 Reliable Aftermarket Parts, Inc. | Michigan, USA | 1-888-672-7876