Blue Opal/Engine

Notes for the engine, a Yanmar 3GM30F.

Tools

Area	Item	Fixing	Driver
Engine	Alternator	Top bolt	14mm
		Bottom bolt	12mm
		Swing bolt	12mm
	Water Pump	Top bolt	12mm
		Bottom bolt	12mm

Starter Solenoid

To solve a starting issue, an automotive relay was installed. The correct relay will have four terminals numbered 85, 86, 30 and 87.

Make up a length of cable from the large screw on the solenoid (battery cable terminal) and connect this to #30. Remove white cable from small solenoid terminal and connect to #85.

Make up cable from #86 connect to engine block. Connect #87 to small terminal on the solenoid.

Terminals #85 & #86 actuate the relay and #30 & #87 power the solenoid.

-- https://www.cricalix.net/2023/05/13/relaying-a-solenoid/

Parts Cross-reference

Item	Page	Original	Alternative 1	Notes
Primary fuel filter		Racor R12P	Fleetguard FS19627	Blue Opal's original filter housing was replaced with a Racor
Secondary fuel filter / fuel strainer	55	Yanmar 104500-55710	Orbitrade 8-55710
Oil filter	38	Yanmar 124450-35100 Yanmar 119660-35150	Blue Print ADS72101	The ADS72101 has a larger outer diameter, but fits. Filter is shared across 1/2/3GMs.

Page numbers reference the Yanmar Parts Catalog.

For fuel filters, https://www.fuelfilter-crossreference.com/convert/FLEETGUARD/FS19627 is a decent reference.

For oil filters, https://www.oilfilter-crossreference.com/convert/YANMAR/124450-35100 is a decent reference.

Filter type: Full-Flow Lube Spin-on
Thread measurement: 20x1.5mm
Outer diameter: 77 mm (Approx. 3.03")
Height: 86 mm (Approx. 3.39")