Raw water strainer

[oakleyb]

My strainer only has about a 7mm hole in\out due to the type of hose connector. If this was increased would this cause a problem ? Engine is a Yanmar 3gmd

thanks

 

[Tranona]

Not sure what type of strainer you have, but the raw water hose for the Yanmar would be 19mm and if using a Vetus type strainer the spigots would also be 19mm so there is no reduction in flow. 7mm sounds very small. Even the little 1GM engine requires 15mm.

 

[vyv_cox]

When I re-engined froma Bukh 20 to a Yanmar 3GM30 I left the original inlet seacock for a season. This was 1/2 inch rather than the preferred 3/4 inch. The engine ran hot and seemed rather rough. Changing to the correct size made a big difference and the flow rate from the exhaust appeared doubled. 7 mm bore is very small and I doubt that the engine will receive sufficient coolant through it.

 

[Tranona]

Yes, the area of the 3/4 pipe is more than twice that of the 1/2. the Vetus strainers have 23 l/min flow rate for 1/2" and 53 l/min for 3/4".