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Post by cyf on Jul 24, 2014 14:05:48 GMT
I hope we'll hear this smooth engine at the National, Alan.
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Post by guidedog on Jul 24, 2014 15:31:38 GMT
We are all hoping that. Cyf
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Post by Deleted on Jul 24, 2014 19:46:30 GMT
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Post by cyf on Jul 24, 2014 20:45:54 GMT
Resurgam, I saw it and want to get one, just for fun
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Post by Deleted on Jul 24, 2014 21:04:53 GMT
Resurgam, I saw it and want to get one, just for fun I wouldn't bother! We bought one at The Haynes Motor Museum and it's a load of rubbish made in China.As we live some way down from the Museum (which is absolutely fantastic) I've emailed and asked for a partial refund as there was a faulty part.
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Post by Welsh Warlock on Jul 27, 2014 22:38:01 GMT
The 3.9/4.2 engine has balancing issues that the other variants don't have due to an issue from when the development work was done. How does he know? Because the company his brother used to run, and for whom he worked, did (at lease some of) the development work on the engine. Land Rover took the specs they supplied but forgot to make specific allowances for the bearings in the balancing. Since Rover didn't realise this until type approval had been completed, it was then too late/too expensive to rectify so they tried to overcome the issue by balancing taking out the imbalance by compensating in the flywheel and pulley. Hence it matter little on other variants of the engine if you swap flywheels and pulleys but on the 3.9 engine it is important that either the engine is kept with its original flywheel and pulley OR that they are balanced separately and latterly as a unit for fine tuning. Alan, I think this is a fundamentally important piece of information, that could easily become lost or difficult to find with the passage of time. Perhaps you should create a new thread, titled something like "Using 3.9 & 4.2 engines" and outline what you have discovered, and include a link back to this thread so the background is available. And then that thread should be made a sticky. Absolutely no point Warwick. That was my intention with this thread but one person derailed it before it even got started and as a result the background info was deleted. I see that same person is still derailing technical threads with infantile suggestions and comments. It appears that the usual etiquette of internet forums is lost on some ignorant people. I am not going to keep producing the information just for someone to keep reducing the thread to stupid and irrelevant suggestions. I tried to document it but I give up. Cyf - I hope so too but it depends what time I have between now and then to rebuild it and instal it. I'm not about to rush it now.
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Post by cyf on Jul 28, 2014 20:18:35 GMT
Well, nevermind Alan, I'll make a drive in the TVR then!
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Post by enigmas on Jul 28, 2014 22:01:29 GMT
There is a lot of sincere interest in the outcome of this technical thread Alan as it holds a potential pitfall when assembling a Rover V8 engine. Personally l'm keen to find out where the cause of the imbalance issue resides. I'm sure there are many others similarly interested. Just focus on the technical stuff and l'm certain the off topic, negative deflections will be seen as irrelevancies and not be fed by forum participants. There is also the option of carefully editing and then locking the thread by a forum moderator when the imbalance issue is resolved. This would preserve the relevant technical content for others when needed.
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Post by johnwp5bcoupe on Jul 29, 2014 5:40:46 GMT
There is a lot of sincere interest in the outcome of this technical thread Alan as it holds a potential pitfall when assembling a Rover V8 engine. Personally l'm keen to find out where the cause of the imbalance issue resides. I'm sure there are many others similarly interested. Just focus on the technical stuff and l'm certain the off topic, negative deflections will be seen as irrelevancies and not be fed by forum participants. There is also the option of carefully editing and then locking the thread by a forum moderator when the imbalance issue is resolved. This would preserve the relevant technical content for others when needed. Once the problem is resolved vince we can do some editing and lock the thread and make it a Sticky but I think it is also a worthwhile article for the Magazine Alan
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Post by Welsh Warlock on Aug 3, 2014 15:26:58 GMT
Some progress today. Crank, rods and pistons thoroughly cleaned and reinstalled back into the block.
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Post by Welsh Warlock on Aug 3, 2014 15:57:19 GMT
Just a thought and possibly one for Harvey or John: I'm using the P5B manual for torque setting but I am working on a later block and internals. Are there any differences in torque settings on the later engines I should be aware of?
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Post by Welsh Warlock on Aug 9, 2014 17:29:14 GMT
Managed to get a good run at this today do the engine is built up and ready to mate up the gearbox and go back in.
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Post by Welsh Warlock on Aug 10, 2014 13:43:10 GMT
Engine in - The answer is close I feel!
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Post by cyf on Aug 10, 2014 21:46:50 GMT
Well done. I hope you don't feel anything!
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Post by Welsh Warlock on Aug 23, 2014 17:53:57 GMT
The formerly vibrating engine was fired up this afternoon and vibrated... ...But only coz the timing was way out - Got it close and ran it up to the vibration zone - It vibrates no more. Just need to put it all back together and set it up now. Phew!
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Post by eightofthem (Andy) on Aug 23, 2014 18:52:25 GMT
Well done. Looking forward to hearing more.
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Post by johnwp5bcoupe on Aug 23, 2014 18:53:04 GMT
The formerly vibrating engine was fired up this afternoon and vibrated... ...But only coz the timing was way out - Got it close and ran it up to the vibration zone - It vibrates no more. Just need to put it all back together and set it up now. Phew! Result well done Alan
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Post by Deleted on Aug 23, 2014 19:59:03 GMT
Well done and all credit due for seeing it through to the end,I bet it was hard to turn the key and keep fingers crossed all at the same time.
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Post by Welsh Warlock on Aug 23, 2014 20:04:36 GMT
Thanks John, Kev and Andy.
I don't think there is much to tell.
I still have a lot of reassembly to do but its running sans vibration.
I have only managed to run it for less than a minute as no cooling system connected yet but it sounds reasonably smotth even though its definitely not set up right yet.
Tomorrow is another day and I hope that by end of Monday I'll be in a position to book an MOT. It ran out at the end of July and is the first time its been without an MOT since I owned it in Jan 2000.
If it passes I hope to bring it to the National but the inside will be in a states of incomplete renovation. A job for the winter.
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Post by enigmas on Aug 23, 2014 22:03:40 GMT
Great news, after all of the frustration trying to remediate the 'vibration' gremlin. Did the 'new shop' find the source of the imbalance?
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Post by Welsh Warlock on Aug 24, 2014 9:55:19 GMT
Andy, see my post dated 18th July 2014. The whole problem was the internals were not balanced individually due to a development issue on the 3.9 and 4.2 engines (doesn't affect the others apparently). Consequently the whole of the moving parts assemblies from pulley to flywheel (or torque converter) need to be kept together as a set. Change one and its hello vibration almost certainly.
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Post by enigmas on Aug 24, 2014 12:37:00 GMT
Ok, so it's an externally balanced engine. (So is my P76 V8). Nothing unusual about that. What it speaks volumes about is the lack of competence of the previous 'expert' engine builders. It truly amazes me that none of them had a clue. When you hear the term 'expert' used, take a deep breath and quickly reverse direction.
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Post by Welsh Warlock on Aug 24, 2014 12:52:45 GMT
A lesson I have been learning over the last few years Andy.
Each time I have entrusted something to so called experts I have encountered problems with only one exception.
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Post by johnwp5bcoupe on Aug 24, 2014 14:21:54 GMT
Andy, see my post dated 18th July 2014. The whole problem was the internals were not balanced individually due to a development issue on the 3.9 and 4.2 engines (doesn't affect the others apparently). Consequently the whole of the moving parts assemblies from pulley to flywheel (or torque converter) need to be kept together as a set. Change one and its hello vibration almost certainly. So in effect Alan if you have a Damper or Flexplate or Torque Converter "change" you would have a problem on a 3.9 and 4.2? it would be a matter of removing the engine to have it all re-balanced? Anyway I am glad you are sorted
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Post by Phil Nottingham on Aug 24, 2014 17:05:04 GMT
Seems like it - or stick to a 3.5 which some experts also say are not worth reconning best to go for a 3.9 or 4.2
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