Mercruiser Parts, Mercruiser Engine Parts, Mercruiser Replacement Parts, Mercruiser Boat Parts, Mercruiser Performance Parts

Closed Marine Cooling Systems

When it comes to protecting your engine investment, the cooling and exhaust systems are undoubtedly at the top of the list. PPT offers unmatched expertise regarding both of these systems including their Mercruiser Parts Finder. After having designed and engineered Mercruiser Parts and OEM systems while engineers at Mercruiser, we now offer you the same design and engineering expertise along with the products we offer. We not only offer marine heat exchangers, mercruiser cooling systems, marine water pumps, Mercruiser heat exchangers and other marine cooling systems parts, but will also assist you in determining the best all around product for your particular application. Not all products are the same, while many are acceptable for certain applications and operating conditions many of the newer engines require more efficient cooling systems to support the recently upgraded engines and engine management systems. Trust the thousands of customers nationwide who rely on PPT for all their marine heat exchangers, marine water pumps, Mercruiser heat exchangers and other marine cooling systems parts. Shop our online store today!

The Truth Behind Fresh Water Cooling Systems

The term “Fresh Water Cooling Systems” also known as “Closed Marine Cooling Systems” can be confusing as these systems circulate antifreeze and not water. Marine Fresh Water Cooling systems are similar to the cooling system in an automobile, however, rather than a radiator they utilize a heat exchanger and rather than using air to remove the heat generated by the engine they use lake or ocean water. The heat exchangers are constructed by inserting a tube bundle of small tubes, maybe 150 or more, into a single large tube approximately 4″ – 6″ in diameter. The raw water pump on the engine flows sea water through the inside of the smaller tubes and makes multiple passes back and forth across the unit while removing the heat from the engine before finally exiting and flowing out the exhaust system. The anti-freeze or “jacket water” flows up and down across the outside of the smaller tubes in one single pass as it dispels the heat load of the engine into the raw water. Select the following link to see a diagram of a typical Half System… These systems are thought to be primarily reserved for people who operate in corrosive water conditions, however as you will see these systems have much more to offer than just corrosion protection. One of the main deficiencies of the standard “open” cooling systems is that they rely on a pressure balance for proper functioning. In extreme cases you can be introducing 40 degree water into the circulation loop that is attempting to regulate the engine at 160 degrees. This makes it near impossible for the engine to operate without some amount of cycling. Also with the onset of more stringent emissions regulations it is near impossible for the open systems to produce a stable enough operating condition that the engine spark and fuel mapping can be maximized.

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Select one of the Quick links to take you to your desired product category:
Heat Exchangers/Oil Coolers	Circulating Pumps	Fresh Water Cooling	High Performance

 

 

Technical Tips and Maintenance Information
FWC Benefits… FWC Basics… FWC Maintenance… FWC Trouble Shooting… FWC 1/2 System Vs. Full System...

 

 

Heat Exchanger & Oil Coolers

PPT also offers a wide assortment of Heat Exchangers as well as Power Steering and Oil Coolers. Once again not all after market products are the same. We utilize higher tube count bundles for our oil coolers and heat exchangers which means more effective surface cooling area in the same overall package size. The OEM’s have began to realize these benefits over the past several years and so should you. Until now the only way to achieve these type of products was to go back with original equipment – no longer! While in some cases we do agree that original equipment is the better option, in these cases we also offer the OEM replacements at the industries lowest available prices, however when there is no specific requirement dictating the OEM replacement don’t throw away un-necessary money.

 

Engine Circulation Pumps

If your looking to replace a worn out marine water pump PPT has a complete line of new marine water pumps. Our pumps utilize stainless steel backing plates, bronze bi-directional impellers as well as ceramic face seals. You will not find a better price on a better product!

PUMP – Inline 4 & 6 Cylinder Engines
PUMP – V6 & Small V8 Engines
PUMP – Big Block V8 Engines

 
 

Engine Mounted High Capacity Systems		Universally Mounted High Capacity Systems		High Performance Systems (500 – 1200 Hp)
Mercruiser
4 Cylinder	6 Cylinder		Small Block V8		Big Block V8
3.0L	Inline 6		5.0/5.7L (305/350 CID)		7.4/8.2L (454/502 CID)
Half System (All Years)Remote Mounted STD Capacity < 80 F Water	Full System (1970 – 2003)Remote Mounted		1970-1983 Small V8 w/ V-Belts (Standard Capacity Full System)		1982-1984 Carbureted with P.S. and V Belts I/O & Straight Inboard (Standard Capacity Full System)
Half System (All Years)Remote Mounted HIGH Capacity > 80 F Water	Half System (All Years)Remote Mounted		1985-1997 Small V8 w/ V-Belt (High Capacity Full System)		1985-1996 Carbureted Big V8 with V-Belts (Standard Capacity Full System)
Half System (1997-1999)Engine Mounted STD Capacity < 80 F Water			1985-1997 Small V8 w/ V-Belt (Standard Capacity Full System)		1996-1999 7.4L/454 Carbureted or TBI with V-Belts (Standard Capacity Full System)
Half System (2000-2003)Engine Mounted STD Capacity < 80 F Water			1997-2001 Small V8 Carbureted w/ Serpentine Belt & High Mounted Port Side Power Steering (Standard Capacity Full System)		1997 454/502 MPI with V-Belts (Standard Capacity Full System)
	4.3L V6
Half System (1998-2005)Engine Mounted HIGH capacity > 80 F Water	1985 – 1997 4.3L V6 w/ V-Belts (High Capacity Full System)		1997-2001 Small V8 EFI w/ Serpentine Belt & High Mounted Port Side Power Steering (Standard Capacity Full System)		1998-2001 L29 7.4L & 454 MPI w/ Serpentine Belt (Standard Capacity Full System)
	1985 – 1997 4.3L V6 w/ V Belts (Standard Capacity Full System)		1997-2001 Small V8 MPI*V DRIVE* w/ Serpentine Belt (Standard Capacity Full System)		1998 – 2001 502 Mag MPI w/ Serpentine Belt (Standard Capacity Full System)
	1997-2001 4.3L V6 w/ High Mounted Port Side Power Steering (Standard Capacity Full System)		1997 – 2002 Small V8 Carbureted & EFI w/ Serpentine Belt (High Capacity Full System)		1990-1993*V-DRIVE* Big Block Carbureted w/ V-Belts (Standard Capacity Full System)
	1997-2001 4.3L V6 w/ High Mounted Port Side Power Steering (Standard Capacity Full System)		2003-Current Small V8 Carbureted & EFI w/ Serpentine Belt & Dry Joint Exhaust (High Capacity Full System)		Big Block GM Engines (High Capacity Full System)
	1997-2002 4.3L V6 Carbureted & EFI w/ Serpentine Belt & Non-Dry Joint Exhaust (High Capacity Full System)
	2002-Current  4.3L V6 Carbureted & EFI w/ Serpentine Belt & Dry Joint Exhaust (High Capacity Full System)
			Small V8 5.0/5.7L  Half Systems		Big V8 7.4L/8.2L   Half Systems
			1985-1997 Small V8 Carbureted & EFI w/ V-Belts (High Capacity Half System)		1985-1997 Big Block Carbureted w/ V-Belt (Standard Capacity Half System)
			Half System (Standard Capacity) 1985 – 1997 V-Belt		1998-2001 L29 7.4L & 454 MPI w/ Serpentine Belt (Standard Capacity Half System)
	4.3L V6 Half Systems
	Half System (High Capacity) 1985 – 1997 V-Belt		High Performance Small V8 Engines W/O Serpentine Belt (High Capacity Half System)		Big Block GM Engines (High Capacity Half System)
	Half System (Standard Capacity) 1985 – 1997 V-Belt
	1999-2001 4.3L V6 Carbureted & EFI w/ Serpentine Belt (Standard Capacity Half System)
Volvo Penta
4 Cylinder	Ford Small V8		V6 & Small Block V8		Big Block V8
2.5/3.0L	5.0L		5.0/5.7L (305/350 CID)		7.4/8.2L (454/502 CID)
Half System (1994 – 1996)	Half System – Standard Capacity AQ190 & AQ240		Half System – High Capacity 1985 – Early 1990’s		Half System – Standard Capacity Late 1980’s
Half System (1997 – 1998)	Half System – Standard Capacity 1993 – 1996 Carb		Half System – Standard Capacity 1997 – 2004		Half System – Standard Capacity 1994 – 1997 Carbureted “GL”
Half System (1999 – 2002)	Half System – Standard Capacity 1993 – 1996 EFI		Half System – Standard Capacity Remote Mount		Half System – Standard Capacity 1995 – 1997 EFI “Gi” & “Gsi”
Half System (All Years)Remote Mounted HIGH Capacity > 80 F Water			Half System – Standard Capacity 2000 – 2002 EFI
OMC
4 Cylinder	Ford Small V8		Small Block V8		Big Block V8
Half System (All Years) Remote Mounted HIGH Capacity > 80 F Water			5.7L Small V8		7.5L Ford Big V8
			Half System – Standard Capacity		Half System – Standard Capacity

 

 

Mercruiser Closed Cooling Systems (OEM Products Breakdown Charts)
Engines W/ Dry Joint Exhaust	I/O Engines W/ O Dry Joint Exhaust	Inboard Engines W/ O Dry Joint Exhaust	Ski Engines W/ O Dry Joint Exhaust

 

 

PPT – High Performance Features & Benefits,

PPT’s High Performance Closed Cooling systems are the industries only product which utilize rotational thermostat housing and intake manifold features.

Rotational Thermostat Housing
Front HP View1
Front HP View2
Side HP