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I've been trying to diagnose an overheating problem. It's a
I've been trying to diagnose an overheating problem. It's a mericruiser 4.3lx 1993. Serial number 0d853277. Impeller has been changed, oil cooler passage is checked and it's clear. Risers and manifold… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
1,880 satisfied customers
I HAVE A 07 MERC 5.7 L RAW WATER COOLED OVERHEATING @180
I HAVE A 07 MERC 5.7 L RAW WATER COOLED OVERHEATING @180 WIDE OR SLOW SO CHANGED THERMOSTAT , CLEARED HOSES OF SOME RUST DEPOSITS . PORT STARBOARD RISERS 150-157 MANIFOLDS P & S 131-139. T STA T HOUSI… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
The engine run s cool the under a load heats up. Installed
The engine run s cool the under a load heats up. Installed new thermostat and water pump impeller. Notice when under way I am feeling a pulse of water in the hoses going to the risers. The other engin… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Recently had manifold and risers opened and checked.
Recently had manifold and risers opened and checked. Replaced with new gaskets. At that point the engine starting overheating at idle, 225+ add a little throttle 1000rpm, it would cool off below 160. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Mercruiser 5.0 possibly overheating. Have 2003 5.0
Have 2003 5.0 Mercruiser. Alarm sounded. Its either low drive lube or overheat. Lube level is correct. Changed water pump and thermostat. Alarm still sounded. Guage on dash shows approx. 180 degrees at idle. Temp gun shows approx. 160 degrees at thermostat housing. Nothing warmer than that except manifold shows 200 degrees. Removed one riser and seems fairly good shape … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Mercruiser 6.2, 2006 overheats at both idle and speed. The
mercruiser 6.2, 2006 overheats at both idle and speed. The following performed: … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Are all 1988 3.0L Mercruiser 4 cylinder engines LH? Water
Are all 1988 3.0L Mercruiser 4 cylinder engines LH? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2014 Mercruiser 5.7 fresh water cooled. It
I have a 2014 Mercruiser 5.7 fresh water cooled. It overheated yesterday. I put a gallon of coolant in tonight and ran it. It stayed at 160-170 at dock idling for 15 minutes. I took it for a ride and … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Have a 1981 260 Mercruiser with an overheating issue, has a
Have a 1981 260 Mercruiser with an overheating issue, has a new water pump, exhaust manifolds, new risers, new thermostat housing and and thermostat. Still overheats.Engine runs excellent!… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
On a 350 carbed mercrusier, both waterpumps just replaced,
On a 350 carbed mercrusier, both waterpumps just replaced, runs hot ,sets off alarm after 45 mins at idle 700 rpms. Boat is in water, cools down to 170 after running 2000 rpms for about 4-5 mins. Shou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
4.3 mercruiser idles ok. Soon as you give it throttle cuts
4.3 mercruiser idles ok. Soon as you give it throttle cuts out. No water coming out the exit ports on the leg. Water is very hot when I pull a bluecap in the cooling system. Also no reading on my temp… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have an after-factory Chevrolet 454cc "big block" engine
I have an after-factory Chevrolet 454cc "big block" engine with a Merc. Alpha I sterndrive on a 22 ft Formula boat, which consistently runs hot after 10 to 15 minutes at full throttle. Could the engin… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,631 satisfied customers
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold sensors throw an alarm at about 175 degrees. The engine temp with a temp gun is 165, the manifold are the same and the risers get up to 20… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have restored a 1974 Chris Craft XK-19 boat. Fresh water
I have restored a 1974 Chris Craft XK-19 boat. Fresh water use only - no salt water use. It now has a 2007 Chevy 350 replacement crate motor. It uses the log style, wet marine manifolds with "hump ris… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
I have a Crusader 454 330 hp overheating. Older engines. Replaced
I have a Crusader 454 330 hp overheating. Older engines. Replaced manifolds and risers 2 yrs ago. Also replaced U cooler, and water pump. Replaced zincs and ran acid through u cooler and heat exchange… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,631 satisfied customers
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs hot about 190 f if i run for a period of 5 minutes or more but if i run 3000 rpm it stays below 190 f . i also have duel props on the out… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a over heating problem with a 260 hp Mercruiser chevy
I have a over heating problem with a 260 hp Mercruiser chevy thru the hull drive engine.It is overheating so I removed the thermostat,boats in Miami,still over heats and the cooling water is black and… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Hi guys. I have a 2001 Baja 302 with 454 efis Never noticed
Hi guys. I have a 2001 Baja 302 with 454 efi's Never noticed before but both stb. exhaust risers are much hoter than port side when running. Boat has 75 hours on it and has always been fresh water flu… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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