Reference Doc B · Engine Fitment

Engine Fitment & Clearance

Old and new engines rarely overlap directly. Measure the engine and the bay, confirm side clearances and service access, and compare to the 4JH-CR footprint before promising a drop-in.

L×W×HBay + engine

ClearanceAll sides + access

EscalateTight → site visit

Principle

Why we measure first

Footprints don't overlap.Engine generations differ in length, width, height and mounting. Never promise a drop-in from the badge alone — measure.

Measure

The engine bay & access

📦Envelope

Bay length, width, height
Bed spacing & height
Hatch / removal opening

↔️Side clearances

Both sides, front, rear
Above (lift/air filter)
Exhaust & intake routing

🔧Service access

Oil fill / dipstick
Filters & belt
Seacock, raw-water pump

Compare

4JH-CR footprint (approximate)

Model	Aspiration	Approx. width (mm)	Approx. height f/centre (mm)	Dry weight (kg)
4JH45-CR	NA	588	459	220
4JH57-CR	NA	588	459	220
4JH80-CR	Turbo	613	473	229
4JH110-CR	Turbo	613	473	229

Approximate, OCR-derived from training material — confirm exact length/width/height against current Yanmar outline drawings before committing to fit. Gearbox/saildrive adds length.

DecisionIf the envelope, clearances or access are tight or ambiguous, escalate to a technician site visit before the estimate goes out.

Field sheet

Engine Fitment & Clearance

Why we measure first

The engine bay & access

📦Envelope

↔️Side clearances

🔧Service access

4JH-CR footprint (approximate)

Fitment measurement sheet