Should turn over quite briskly, and start almost immediately. But the current draw is high, so the starting system is sensitive to poor connections. I had problems with the solenoid, but it turned out that the problem ultimately was the earth strap across the LH engine mount. I supplemented this with a link between the transfer case and the chassis, and ran the battery earth to the transfer case. No more solenoid problems! (Need to use glow plugs to counter slow cranking speed is normal.)
The thing to do is to check for voltage loss while cranking. As well as the earth strap, look for any other voltage drop - I have heard of a faulty connection between the lug on the battery lead and the wire itself, and I have had to clean the lug on the solenoid. With the current draw for this engine when starting, everything needs to be right. It is perhaps worth noting that most Isuzu trucks with this engine have 24v electrics.
Also, the battery needs to be in good condition. I had hoped mine would last through this winter, but in July had to get a new one. The old one is working like new in my petrol engined S2a!
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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