Volvo penta d3 190hp long cranking before engine starts inhector test 20mls after 1 minute is that ok8

My steps for this would be:

1. Check heater plugs are working. I don't know that engine, but a lot (most?) have them wired in series so, if one dies, it'll take down the others
2. Clean starter and battery terminals - the engine needs lots of nice healthy amps to turn over fast, and it doesn't take a lot of corrosion to make cold starts harder
3. Compression test
4. Get injectors serviced
 
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