Member Since: 21 Oct 2016
Location: kent
Posts: 13854
Ur so welcome , hope it helps
Know the guys here are extremely knowledgeable if u get stuck
13th Apr 2020 9:27 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
What you also can consider to keep initial cost in this phase low is this;
Take an old but good pump... (you can have one from me, for postage/shipment costs, but i think there are UK residents here who can help you out at even lower shipments costs from inside the UK)
Mount it.. time it . Mount a good used belt and crank the engine to test the compression in each cylinder...
If all ok, then it make sense to invest in a new and therefore upgraded stronger oillpump, new seal (and tool) and a new cambelt set incl rolllers...
That is what I would do....
Buying and mounting a new pump, only to find out, the engine is at its end....
There are pro’s and con’s for this method, but you can consider it..
Another thing, if the heads/valves are faulty...
If you are able to take the heads of without body off, you are also able to mount another complete engine without body off
Keep in mind..
If the valves are bent, there is a chance the conrods also are slightly bentBest regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
13th Apr 2020 9:38 pm
motorworks
Member Since: 14 Nov 2019
Location: Usk
Posts: 412
This may help you. It is a video series covering the same job on a RR Sport.
&t=18s
You are getting involved in a difficult job taking many hours, also requiring some special tools or improvisation. Hope you have a successful outcome.
13th Apr 2020 10:32 pm
Gimpyfin
Member Since: 07 Apr 2020
Location: Christchurch
Posts: 12
This video series on YouTube is brilliant! Exactly the same failure as my engine.
Good to see it can be rebuilt though! That said. Really wish I had a lift to take the body off. Would actually be a lot easier and probably quicker in the long run 🤦♂️
16th Apr 2020 12:38 pm
Gimpyfin
Member Since: 07 Apr 2020
Location: Christchurch
Posts: 12
Engine smoking
Been a while but I have an update. The engine has been rebuilt. A total of eight bent valves in the end although only very slightly. And yes the body came off to do it. Lol
All seemed to be going very well until it was time to run the engine. It idles fine and very smooth. However after a short drive (approx 3 miles) it started billowing blue smoke and then reviving away as combusting oil.
The engine does not breath heavily at idle so find it hard to believe it’s piston rings etc pressurising the crank case. There wasn’t any damage to the pistons either after removing the heads.
The oil seems to be entering the induction side of the engine. Intercooler is filling up with oil.
Initially thought it was the turbo so replaced it with a reconditioned turbo. Still the same.
Any thoughts or advise from you guys would be greatly appreciated.
6th Sep 2020 12:20 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20782
You have a cracked/damaged piston
Crack will only open up under load, and the boost pressures and temperatures increaseMy D3 Build Thread
Member Since: 07 Apr 2020
Location: Christchurch
Posts: 12
Thank you for your reply. If the piston is cracked or damaged I would have seen some damage when the heads were off? There was only one very slight mark on one piston.
On these engines is it normal with piston failure for it pressurise the crank case to such and extent that dumps oil through the breather back into the induction side?
Also when the engine is fully warm it doesn’t breath at all?? Surely you would see something??
6th Sep 2020 12:43 pm
jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
if you have bent 8 valves then more than one piston has had valve contact....
The piston may be cracked on the skirt / ring groove where you cant see, or small enough that you wont see it anyway... OR the conrod has bent, you will not see that either.....
You would be unlucky mind, as you get away with a little valve tap most of the time on most engines.
Have you cleaned out the induction pipes / intercooler ?
Was the turbo actually knackered when you replaced it ?
6th Sep 2020 1:18 pm
Gimpyfin
Member Since: 07 Apr 2020
Location: Christchurch
Posts: 12
The valves must have only just been touched as barely bent. Only very slight seepage of oil round the seat when testing the heads before rebuild. The old turbo wasn’t knackered. Just a bit worn. At the point of replacing the turbo we just hoped that was the cause of oil. Clearly not though.
When the timing belt tensioner failed it was at idle. So considering everything I didn’t imagine the piston would have been hit that hard to have cracked it.
6th Sep 2020 1:26 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10489
I wonder if you were to remove the injectiors would you see an oily deposits on the tip to show which cylinder had the issue.
Could also do compression tests.
6th Sep 2020 2:21 pm
Gimpyfin
Member Since: 07 Apr 2020
Location: Christchurch
Posts: 12
Thank you for the replies. Compression tests is the next port of call. But will possibly only show up if done once the engine is hot. I just still feel quite shocked that it could be a cracked piston. The valves that were replaced were so lightly touched. Tbh the oil seepage when testing the head could have been that of a on old engine and re lapping the valves would have been enough. Only reason we changed 8 was because I didn’t want to take any risks.
The question is if one piston has a hair line crack in it. How quickly would it pressurise the crank case. Would it do so to such an extent within a three mile journey?
Is there chance of something going wrong in the breather side? Siphoning oil?
6th Sep 2020 3:07 pm
jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
i guess there is a possibility of there being something wrong on the breather side, no idea what though
How much oil are you getting in the intake side ? if you take the bottom hose off the intercooler how much oil has collected in there ?
Did you replace the valve stem seals when the valves were done ?
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