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200 Series General Forum for the Volvo 240 and 260 cars |
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Help! First breakdown in 15 yearsViews : 3819 Replies : 47Users Viewing This Thread : |
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Feb 1st, 2020, 21:27 | #31 |
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How different is the head? SOmething in the back of my mind says it will fit with the right gasket set but wait until someone else confirms that.
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Feb 1st, 2020, 22:03 | #32 |
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Hello Laird Scooby,
I'll try to get some photos of the two heads tomorrow. I should've taken a photo of the original one before buying another, but you live and learn don't you? Cheers, Chris |
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Feb 2nd, 2020, 07:42 | #33 |
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Chris. Thanks for the update. I would take both heads to a motor engineering workshop and ask for advice.
But instead I'm going out to view some Rembrandt. Lucky me. Good luck. . |
Feb 2nd, 2020, 09:33 | #34 |
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You could put the valves from the ‘new’ head into the ‘old’ one, but I expect you’ll be able to pick up another new head complete for low enough money that it won’t be worth the effort...
Of course if the ‘old’ head doesn’t have any other damage, just the valves... Cheers |
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Feb 2nd, 2020, 09:48 | #35 | |
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Correct me if i'm wrong, but doesn't the red block use shim adjustment for the valves?
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Feb 2nd, 2020, 10:09 | #36 | |
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The momentum of the spinning shaft will keep it turning until the effort of compressing the valve springs or hitting some of the valves overcomes it. It would depend on the speed of rotation at the moment the belt broke. Belts normally break at low speed, because the belt is then stressed more by the slow hammering of the cam lobes. At high speed the varying stress happens so quickly it evens out, so a fast spinning shaft takes less power to turn than a slow one. Obviously in practice any damage is largely a matter of chance. I've read of engines completely trashed through a breaking belt, but also of miraculous escapes where even an interference engine has escaped all damage just through the lucky position of the cam shaft. |
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Feb 2nd, 2020, 10:45 | #37 | |
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The main reason belts break at low speed is because of having to overcome the inertia of changing speed from zero (it it's during starting) to idling or from idling to 1500-2000rpm to pull away. It can also happen at the end of a long, fast run where the change from being on throttle to being off throttle causes many dynamic changes within the engine.
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Feb 2nd, 2020, 14:40 | #38 | |
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Yes it does use shims. Cheers |
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Feb 2nd, 2020, 16:13 | #39 |
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First break down
Hi Had my 240 for sometime so over the years i have repaired and replaced many parts.About 10 years ago i had a head gasket go ,I had the head skimmed put it back together it started and run but unfortunately i did not torque the crank bolt sufficient and it jumped a tooth.Luckily and i dont know why no damage to the valves just re timed it and it was fine..Strange?? When the cambelt went it destroyed all the valve,Regards Ron.
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Feb 2nd, 2020, 16:30 | #40 | |
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You obviously had a guardian angel-mechanic looking after you that day though!
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