Type: RHB52 (IHI)

Model: MY29

More info from an Ebay listing of a reportedly brand new turbo:

Part Number: VA130035
Short Spec.: MY29
Interchangeable Number: B51CND-S0035B, B51CND-S0035G, NN130041, MY20
OEM Number: 12947218000, 129492-18000, 12949718000, 129497-18000, 5T-611
Turbo Model: RHB52H, RHB52H-52002P15NFBRL348C
Manufacturer: IHI Turbo - CloverTurbo

Year: 1983-89
Engine: 4JH-TE, 4JH-TZ
Displacement: 1.64L, 1644 ccm, 4 Cylinders
Power: 55 HP

Angle α (Compressor Housing): 90º
Angle β (Turbine Housing): 218º
Back Plate: NN133021 (64T-002)
Bearing Housing: NN133382 (N133422/N133432)(Oil Cooled)
CHRA: NE920018
Compressor Cover: NN134072
Compressor Wheel: NN136512 (39T-027)
Gasket (Oil Outlet): 210636 (Gasket Paper)
Gasket (Turbine Inlet): 210276 (2445051)
Heat Shield: NN137055 (38T-013)
Protector Cover (Turbine Housing): NN139724
Repair Kit: NN139922 (509T-545)
Turbine Housing A/R: 15
Turbine Housing: NN139452
Turbine Wheel: NN131612

Application:
1983-89 Yanmar Marine with 4JH-TE, 4JH-TZ Engine

With regards to compression:

"This is what I just found from my file about the compression spec for the 4JH-TE Yermo Lamers. Standard is 341PSI. Limit is 270PSI and fluctuation between cylinder is 42.7PSI. I got this info from Yanmar Japan years ago. The readings are from a warn engine and the crank speed is about 300RPM. No throttle at all. Since we pulled all the injectors to do the test, there is no sense to have the throttle on (better off). We don't want fuel spitting all over."