Description

ZF 3312107003 is a marine transmission gear oil cooler kit used to help control transmission oil temperature on supported ZF marine gearboxes. It is commonly listed for ZF 63/68IV and 80/85A/IV transmission families, with supporting references also describing it as a genuine ZF cooler kit for 63IV and 80A/V transmissions using 1.25 in. raw-water ports. This kit is used where the gearbox cooling circuit requires the correct ZF cooler assembly to maintain proper oil temperature under load.

Key Features

• Genuine ZF marine gear oil cooler kit reference
• ZF part number: 3312107003
• Used for supported ZF transmission oil cooling applications
• Commonly listed for ZF 63/68IV and 80/85A/IV transmission families
• Supporting fitment reference: 63IV and 80A/V transmissions
• Raw-water port size reference: 1.25 in.
• Helps reduce transmission oil overheating under load
• Supports proper lubrication temperature and gearbox service life
• Common kit listing shipping reference: approximately 8 lb, 12 in. x 10 in. x 8 in.

Transmission Compatibility

This cooler kit is associated with ZF marine transmission applications including ZF 63IV, ZF 68IV, ZF 80A/V, and 80/85A/IV configurations where the gearbox and engine raw-water system use the matching 1.25 in. water-port setup. ZF option references also show 3312107003 as the oil cooler kit option under the ZF 63IV transmission accessory group.

Serial Number Fitment Notice

Transmission cooler fitment depends on the exact ZF transmission model, transmission tag, reduction ratio, oil cooler plumbing, raw-water hose size, engine cooling layout, and installation space. Always confirm compatibility using the ZF gearbox identification plate and the existing cooler setup before ordering. Do not match by “ZF 63” or “ZF 80” alone.

When This Part Needs Replacement

Replace the transmission oil cooler if it is leaking, corroded, restricted, internally contaminated, damaged by seawater, or no longer maintaining proper gearbox oil temperature. Replacement is also recommended if there is evidence of oil/water cross-contamination, unexplained transmission overheating, or a failed pressure/vacuum test on the cooler.

Installation Notes

Confirm the cooler orientation, hose size, oil-line connections, and mounting arrangement before removal. Flush or inspect the cooling circuit if the old cooler failed from corrosion or blockage. After installation, check transmission oil level, inspect for seawater and oil leaks, verify raw-water flow, and monitor gearbox temperature during sea trial or loaded operation.

Alternate/Superseded Part Numbers

• ZF 3312107003
• 3312107003
• ZF-3312107003
• ZF Marine Oil Cooler Kit 3312107003
• ZF 63/68IV & 80/85A/IV Gear Oil Cooler Kit
• ZF 63IV / 80A/V Oil Cooler Kit

Parts Desk Insight

This cooler is best matched by the transmission tag and raw-water port size, not by gearbox family alone. The 1.25 in. water-port detail matters, and confirming the existing cooler connections before ordering helps avoid hose, bracket, or oil-line mismatch during installation.

Shipping: Ships same or next day for fast Canada wide shipping.