1968 Checker Marathon Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

16 Coolant / Antifreeze parts are listed for the 1968 Checker Marathon, from PEAK, PRESTONE, FVP and 1 other brand. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 1968 Marathon.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, FVP, PRESTONE, PEAK and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Heavy Duty section lists 1 option from VALVOLINE — rated for severe service. VALVOLINE ZXG051 is listed in this group.

The Premium section lists 4 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 6 options from PEAK, FVP and PRESTONE — built to original-equipment specification. FVP GREEN5050GAL is listed in this group.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 1968 Checker Marathon — CONTINENTAL 63692.

This table covers the adapters used to pressure-test this cooling system. Read more

3 Cooling System Tester Adapter parts are listed for the 1968 Checker Marathon, from ACDELCO, GATES and MOTORAD. All of them fit every engine offered in the 1968 Marathon.

Listed part numbers: ACDELCO 12A01, GATES 31413 and MOTORAD 3003.

This table covers the caps that hold system pressure at the radiator or reservoir neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

5 Radiator Cap parts are listed for the 1968 Checker Marathon, from GATES, MOTORAD and SKP. MOTORAD T13 carries the "Popular" badge. All of them fit every engine offered in the 1968 Marathon.

The Locking Replacement section lists 2 options from GATES and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. GATES 31511 is listed in this group.

The Standard Replacement section: 3 options from MOTORAD, GATES and SKP. MOTORAD T13 is listed in this group.

This group includes MOTORAD T13, GATES 31511 and MOTORAD ST13 and the remaining parts above.

This table covers the Radiator Fan clutches. Typical signs include slip at highway speed, chatter on takeoff, or a pedal that stays low. Resurface or replace the flywheel with the clutch — a heat-checked flywheel wastes the new disc. Read more

17 Radiator Fan Clutch parts are listed for the 1968 Checker Marathon, from FOUR SEASONS, HAYDEN, ACDELCO and 2 other brands. ACDELCO 1580244 carries the "Popular" badge.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

24 Radiator Hose parts for the 1968 Checker Marathon come from 4 brands — DAYCO, CONTINENTAL, GATES and 1 other brand. The "Popular" part is GATES 26611.

The Economy section: 12 options from CONTINENTAL, DAYCO, GATES and 1 other brand. GATES 26611 is listed in this group.

Standard Replacement: 12 parts, from DAYCO, ACDELCO, GATES and 1 other brand. A representative part number is ACDELCO 22219M.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

24 Thermostat parts for the 1968 Checker Marathon come from 2 brands — MOTORAD and GATES. The "Popular" part is MOTORAD 2000160. 22 parts fit every engine; the other 2 are engine-specific.

The Economy section: 5 options from MOTORAD and GATES. GATES 33508 is listed in this group.

Heavy Duty: 3 parts, from MOTORAD. A representative part number is MOTORAD 5200160.

The Performance section lists 4 options from MOTORAD — engineered beyond original-equipment specification. MOTORAD 2000160 is listed in this group.

Premium: 4 parts, from MOTORAD. A representative part number is MOTORAD 7200180.

Standard Replacement: 8 parts, from MOTORAD and GATES. A representative part number is MOTORAD 200195.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

12 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 1968 Checker Marathon, from MAHLE / CLEVITE, FEL-PRO, VICTOR REINZ and 3 other brands. FEL-PRO 35062 carries the "Popular" badge. 6 parts fit every engine; the other 6 are engine-specific.

This table covers the housings and outlets the thermostat sits in. Read more

8 Thermostat Housing / Water Outlet parts for the 1968 Checker Marathon come from 4 brands — DORMAN, GPD, FOUR SEASONS and 1 other brand.

The Economy section: 4 options from DORMAN and GPD. DORMAN 9022018 is listed in this group.

Standard Replacement: 4 parts, from FOUR SEASONS and MOTORAD. A representative part number is FOUR SEASONS 84852.

This group includes DORMAN 9022018, DORMAN 9022014 and GPD 8241278 and the remaining parts above.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

14 Water Pump parts for the 1968 Checker Marathon come from 5 brands — US MOTOR WORKS, GMB, DAYCO and 2 other brands. The "Popular" part is GMB 1301350P.

The Economy section: 4 options from FVP and US MOTOR WORKS. FVP US895 is listed in this group.

The High Volume / Pressure section lists 3 options from US MOTOR WORKS and GMB — grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. GMB 1301350P is listed in this group.

Standard Replacement: 7 parts, from DAYCO, GMB and ACDELCO. A representative part number is ACDELCO 252581.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

12 Water Pump Gasket parts are listed for the 1968 Checker Marathon, from FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 1 other brand. FEL-PRO 5152 carries the "Popular" badge.

This table covers the Water Pump Stud kits. Read more

3 Water Pump Stud Kit parts for the 1968 Checker Marathon come from ARP.

Listed part numbers: ARP 1343204, ARP 1343203 and ARP 4343203.