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Update on 740 Turbo engine longevity post 700 1989

posted by  jmars on  Sun Feb 29 02:47 CST 2004
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last visit: Wed Jan 2 02:18 CST 2008
[RELATED]

I agree with the 245 TIC longevity, I got mine to 340k before selling it to move to a 745 TIC. True it did need a new head after 250k, I really don't know why because I bought it with 220k on the odometer. I would also suggest synthetic oil changed regularly ( every 5k) and moderate normal usage. My 745 has not proven as reliable needing a full rebuild at 185k due to a burnt #1 piston. I have not really tracked down the reason but I believe it was due to oil seal leakage due to a pressurized crankcase after extended boost. If you track down the crankcase ventilation scheme you will notice a hose from the intake manifold to the breather hose. I believe that this hose can result in a pressurized crankcase during extended boost conditions causing main seal leakage, especially at the rear crank seal if you are climbing a long grade. Since I added a PCV valve to this hose, I have had zero oil consumption. I hope that this simple fix has elevated the 745TIC to the reliability of the 245 TIC. It is surprising to me that Volvo chose to save the cost of this valve (under $5 at AutoZone) and risk their reputation for durability.






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