Honda Outboards BF40A/BF50A Service Manual, Page 26Get this manual
HONDABF35A 45A OIL PRESSURE TEST 1) Check the engine oil level (P3-2)2) Remove the mm screw and oil pressure switch
4 mm SCREW
1 Oil PRESSURE SWITCH
3) Install the pressure gauge attachment (special tool) on the
oil pressure gauge that has scale calibrated to maximum of 7-10 kgcm2 (99.6 -142.2 psi) scale and on the outboard motorCAUTION TIghten the gauge attachment to Nom (0.9 kg-m, 6.5 ft-Iblo Overtightening will damage the threads4) Remove the propeller and set the outboard motor in water
I S.ToOL PRESSURE GAUGE
ATTACHMENT
OIL PRESSURE GAUGE