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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Cam belt timing marksViews : 1802 Replies : 34Users Viewing This Thread : |
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Mar 18th, 2020, 15:11 | #21 |
bob12
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Mar 18th, 2020, 15:45 | #22 |
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Hy Bob
https://www.volvoforums.org.uk/showthread.php?t=302747 B200F are hard to find in Germany. Only if imported from Italy. I did have 2 at minimum with bent valve, thought the shaved head as a reason. Now I did learn something. They are interference engines B200FT I don't know. One is in my workshop. I will have a closer look. Stay free from corona, Kay |
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Mar 18th, 2020, 15:46 | #23 | |
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Mar 18th, 2020, 15:47 | #24 | |
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How it was managed, whether the head had previously been skimmed to within a nicron of its life or what i don't know. HOwever, one person reported they'd never had the head skimmed although they had the head gasket done during the life of the car. Read into that what you will. I've seen a head (not Volvo) where the owner was driving at 150mph ish and burned a hole in the piston, said lump of molten alloy somehow jumped onto the crown, bending at least one valve but also causing the timing belt to jump and the other 15 valves to become bent. It also suffered HGF, from what we could deduce the lean mixture (old, clogged injectors and a bit too much boost) caused the overheat and HGF and then the resultant melted piston etc. Because it was the turbo version (and the pistons were shorter above the gudgeon pin than the n/asp version) it was listed as a non-interference engine. The n/asp was listed as interference though. My theory is that wear in the gudgeon pins, big ends and a heavy previous skim (obvious when we measured the depth of the head) removed the safety cushion that would otherwise have been there. Perhaps something similar (but maybe not so drastic) has happened with these B200Fs the reports are about. Purely conjecture butthat's all we have sadly.
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Mar 18th, 2020, 15:52 | #25 | |
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Mar 18th, 2020, 15:55 | #26 | |
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It could also be the natural point of least tension on the timing belt because most other valves are closed, i haven't looked into it. Volvo do say to do it at #1 TDC and i know on my Rover, once the tension has been set at TDC, turn it twice then turn it past TDC to a blue groove on the crank pulley (line it up with the pointer on the timing cover) which is about 18 deg ATDC and then reset the tension, turn it twice more and check/set the tension again so presumably a similar idea. Sometimes the reasons aren't obvious but failure to observe the procedure results in serious pain in the wallet area. On things like that, unless i know the reasons why and can take them into account, it's a case of follow the procedure, no matter how daft, pointless or futile it may seem.
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Mar 18th, 2020, 15:56 | #27 |
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Pretty much what i guessed at then Kay?
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Mar 19th, 2020, 15:10 | #28 |
bob12
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It is my personal view that B200F's in their original state were not interference engines, but subsequent head skimming etc is the cause of any problems. Somewhere I had a very detailed list of all Volvo engines of this era and past interference and not. I know for a fact it wasn't there or any other data sheets as I was particularly interested in the B200F. Unfortunately, it all went the way of most things I didn't back up when my previous computer imploded. Bob
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Mar 19th, 2020, 16:16 | #29 | |
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It came the time that i needed the other PC so i investigated the possibility of fixing the Samsung 22" and decided that for the cost, i could have a refurbished monitor delivered from ebay. Ordered it yesterday, it arrived today, did the basic test and the monitor seemed ok so tried to turn the PC on - dead. Trying the obvious first (the power lead) i put the lead from the monitor into the power socket on the back of the PC to be met by a flash and a bang from the PSU in thebottom of the PC case. Sods Law or what! I could send the (now spare!) refurbished monitor back and get a refund but it would cost half of the refund to send it back (if not more!) so i'll keep it as a spare just in case. Meanwhile i'll explore the possibility of fitting the HDD from my old PC into my main one as an extra and bin the remains of one of Alan Sugars finest (the old PC is a Viglen) and/or find a secondhand PSU or something. If nowt else, i'll repurpose the case as something or other useful if possible. The main thing is the useful stuff on the HDD, maybe one of those external HDD adaptors/cases would be the answer..........
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Mar 19th, 2020, 19:51 | #30 | |
bob12
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It was a common engine spec in 1990 in the UK for company car personal tax purposes. One is roadworthy and the other a breaker. Fortunately, I have never had to take the heads off. Personally, considering what I have seen over the years I reckon any problem with crunchy valves is due to skimming or changing the original head spec in some way. Bob |
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