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DRIVES WITH IMPELLER IN THE DRIVE

TO TROUBLE SHOOT THE WATER SYSTEM OF A MERCRUISER YOU

MUST DEVIDE THE COOLING SYSTEM INTO PARTS AND CHECK EACH

FOR PROBLEMS.

1) THE DRIVE AND INPUT HOSES

THE EASIEST CHECK FOR THE DRIVE AND PUMP SECTION IS TO DISCONNECT THE HOSE WHICH

COMES FROM THE DRIVE BEFORE IT PASSES THRU ANY OIL COOLERS.  WITH A FLUSHETTE ON

THE DRIVE MAKE SURE THAT THE WATER SEAL ON THE FLUSHETTE ON THE SIDE OPPOSITE THE HOSE

HAS EXCESSIVE WATER LEAKING AROUND THE SEAL WHICH MEANS THE FIXTURE IS ON CORRECTLY.

IF WATER COMES OUT OF THE INSIDE HOSE NOW WITH THE ENGINE OFF THE IMPELLER IS BAD.

 

NEXT START THE MOTOR AND SEE IF THE WATER SUPPLY FROM THE INPUT HOSE

LOOKS  ADEQUATE TO COOL THE ENGINE.  

THE NEXT TEST IS TO WATCH THE FLUSHETTE WHILE SOMEONE REVS THE ENGINE UP TO APPX 3000 R.P.M.S.  

DURING THE HIGHER ENGINE SPEED THE EXCESS WATER LEAKING AROUND THE FLUSHETTE SHOULD

GO AWAY AND SUCK DRY. IF THE FLUSHETTE DOES NOT GO DRY THE IMPELLER IS PROBABLY DEFECTIVE.

2) THE OIL COOLERS AND THERMOSTAT

RECONNECT THE OIL COOLERS AND THE THERMOSTAT AND RESTART THE MOTOR WITH

THE HOSES FEEDING THE MANIFOLDS DISCONNECTED AND IF THE OIL COOLERS AND THERMOSTAT

ARE CLEAR, THE FLOW FROM THE MANIFOLD HOSES SHOULD LOOK ADEQUATE TO COOL THE ENGINE.

REMOVE THE THERMOSTAT AND CHECK IF IT OPENS IN BOILING WATER.

3) THE MANIFOLD AND ELBOWS

THE INPUT HOSE FOR EACH MANIFOLD IS FED BY ABOUT 1-1/8" HOSE THEN IT FLOWS INTO THE ELBOW

AND OUT INTO THE EXHAUST.  EVERY DROP OF WATER WHICH COOLS THE ENGINE MUST BE

EQUAL TO THE EXHAUST WATER.  IF THE ELBOWS ARE NOT CLEAR THE WATER WILL NOT GET

OUT AND THEREFORE NONE WILL COME IN.

TO CHECK MANIFOLD/ELBOW FLOW, CONNECT A GARDEN HOSE INTO THE INPUT HOSE FOR EACH

 SIDE OF THE MANIFOLD SET OR ONE ON THE IN LINE ENGINES.  IF A SECONDARY RELIEF HOSE GOES

TO THE ELBOW, USE A VISE GRIP ON THE HOSE TO BLOCK THE FLOW.

NOW THE TEST.  WITH THE FULL CITY WATER FLOW INTO THE MANIFOLD AND PASSING OUT OF

THE OUTSIDE PROP AND EHXHAUST RELIEF HOLES,  FEEL THE HOSE TO THE MANIFOLD,  YOU

SHOULD BE ABLE TO CRUSH THE HOSE WITH YOUR HAND AND FEEL THE FLOW THRU THE HOSE.

IF, HOWEVER THE HOSE FEELS LIKE IT CONTAINS HIGH PRESSURE AND FEELS IT WILL BURST,  

YOUR EXHAUST SYSTEM IS BLOCKED.  THE ELBOW SHOULD BE REMOVED AND CLEARED OR REPLACED.

4) LOST WATER FROM DRIVE

OUTDRIVES HAVE SEVERAL PLACES WHERE THE WATER FLOW PASSES THRU SEALS.  SOME SEALS OR

 HOSES GET LEAKS WHICH LIMIT COOLING WATER.  IF YOU BACK FEED THE HOSE FROM THE INSIDE

TRANSOM WATER HOSE AND LOOK FOR WATER COMING IN THE TRANSOM AREA YOU HAVE A LEAK.

WHATEVER  IT IS, THE HOSE OR THE RUBBER CONNECTIONS IN THE OUTDRIVE INPUT, THERE CANNOT

BE ANY LEAKS. REPLACE BAD HOSE OR SEAL.  WITH THE LOWER DRIVE OFF THE SAME HOSE

SHOULD BE BACK FED TO CLEAR ALL INPUT HOSES AND CONNECTIONS.

5) UNEVEN ELBOW TEMPERATURE

IF AFTER THE ENGINE IS COOLING PROPERLY, PUT YOUR HANDS ON THE ELBOWS AND SEE THE

HEAT FROM EACH.  IF ONE IS HOTTER,  THE T/STAT HOUSING IS FAVORING ONE SIDE WITH

MOST OF THE WATER.  IF YOU TAKE FOUR PIECES OF 5/8" WATER HOSE APPX 3 INCHES LONG

AND INSERT  THEM INTO THE FOUR WATER HOSES FROM THE HSE TO THE MANIFOLD AND TO THE ELBOW.

THESE HOSES WILL RESTRICT THE FLOW AND CAUSE THE WATER TO EVEN OUT.

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