When started it runs fine idles fine even boosts fine but is knocking at the same speed it sounds like its coming from the back of the engine. As I say it starts fine so could it be the starter not disengaging? Or am I up sh1t street and the engines buggerd? It went away for a bit then came back with avengence. The 5 is now in the garage. And staying there as Iv had enough of it for now.. Anyone had the same?
Manifold gasket can sound like a knock
U got exhaust downpipe bracket in place? Might be loose
Really? Hmmm I was thinking of taking the manifold off to see if the starter is playing up. It really sounds bad though but runs fine. Manifold gasket is one of the very few things I haven't replaced. Just wondering why it would go away then come back?
Maybe you have lost some of your manifold nuts?? or they are loose.
As they expand with heat, they become looser, making the noise. As they cool, they tighten and the noise goes??Just a guess...
Get some locking nuts and a new gasket maybe...
My fears are its alot worse than that... But I will give it a go..
see if you can record the sound and upload it.
I only have the iPhone to come on here but photoshop won't play sound.. Could you pm me your number and I send it?
Bring it round here if you want will have a look
ive not got the internet working on my phone yet lol. since i swapped to my sim from my wifes contract.
Regular tapping ?
Does it change when you press the clutch in ?
Does it happen to knocker louder / harder when you rev the engine but almost go quiet when you let off the thottle ( then it returns on idle ) ?
It's very metallic we just had the cover off and two of the rods feel a little bit looser than the others.. I'm hoping it's that.. Video to follow off ron. Cheers for coming down so fast..
Here is a link http://www.youtube.com/watch?v=7kNoD...e_gdata_player
Like he said sounds like tappets I'm going round tomorrow to dig abit deeper starting with the tappets
Bottom end knock that mate. Sounds identical to mine when it failed. I have a post and video on here ...
If you mean push rods then they will?Originally Posted by Nottswoody
Should the pushrods be loose? The two closest the turbo are looser than the others. So Andy did your bottom end go?
Just out of interest what boost was you running?
I ran predominatly 14psi on a t2/25 for 300mi , then around 100mi at 20psi on a t28.
Yep same. Bugger :-) so how much am I looking at?
Two schools of thought!
1) Pikey. ( aka AndyBond )
Bang a new ( to you ) engine in it. Fingers crossed it stays together
2) DILAP ( Do It Like A Pro )
Replace all the internal moveable parts ( big ends , caps all that jazz ) and do it properly.
2) will cost slightly more, but your electricity bills will go down as you will have a inner glow that you have done a job properly.
:-( it does have a knocking noise the more you rev it gutted mate
So roughly in ££ Full rebuild
You building it yourself ?
Yep in for a penny..
or you take the sump off.
undo the big end caps - and change the shells.
then undo ALL the main caps and check the crank surface, then using a feeler gauge - push the shells out on top of the crank. use a small screwdriver to push the new ones back in. you will probably not be able to change the top bearing closest to the timing cover as the chain/tensioner will not allow you really pull the crank down at all.
also remember to pack the base of the oil pump with molyslip grease.
cost of the bearings is about £50
big end bearings - £28
main bearings-£31
h/g set-£50
bottom end gasket set-£30
thrust washers-£6
timing chain-£30
you will also need the crank checked for damage
while its apart I would get new piston rings - £60, and hone the liners,
cant thing of anything else at the min
not alot really if you are going to do it yourself
Oh that's not bad at all... I thought.. Box of matches 20p
Probs a silly question, but what is the most likely cause of a bottom end failure? Over revving? High miles/wear an tear?
So who has the links to step by step rebuild.. Had a quick look through wizard..
Well I never over revved it never been over 6ooo it's more lickley poor fuelling as my carb was always too rich.. Plus 20psi must of just been too much.. I never went above 100mph until a couple of days ago but only did it the once. Drive fine until today then today it just happend out of nowhere.. Think I will just leave the 5 in the garage for a bit.. It's eaten all my ££££.. Silly boy..
Burn itsell it
your carb and turbo have caused the damage when we checked carb it was a standard venturi 1.5 main jet and a 1.5 second stage defo over fueling in low 10,s cant be good for your big end bearings and piston rings and running more than 1bar would be no good for them even with your new turbo the actuator bracket was held on with one bolt and wasent boosting right the bracket was bending and it took its time for the gauge to move while on full throttle. id be looking for a second hand engine with a 285 cam in it or buy one and put it in you need one for the T25 you have. keep the other engine for spares. ill help you drop it in if you need a hand.Burn it
Selling a blown bottom end in classifieds if it's of interest, fairly local aswell, rebuild and slap your head on, job done.
the excess fuel dilutes the oil nicely - ruins the oils properties.
Anyone got any napalm
Last edited by Tony Walker; 07-05-2012 at 19:14.
Ha tony is that the shake of discussed?
Its easily donethere just too damn fun even when you know its not right the damn cars make you boot it lol.
I didnt realise it had a 1.5 main jet in it thochances are its contaminated your oil and killed the bearings.
But I only drive at 30mph and use it on Sundays to take nanna shopping. I'm going to have to leave it now this year I think as its broke my bank killed my sex life the kids hate me and my street cred went from hero to zero in a day. And I'm dreading all the **** I'm going to take at work tomorrow. The question is now who's engine do I trust? Do I rebuild my own? Do I go all out and tear it to bits? But as of now and prob the next twelve months it's back to the bike for me.. I was getting fat anyway
Rebuild it yourself
Ill bet the failure was down to poor oil pressure and very thin oil due to bore washing as fuelling was too rich, revs dont kill these engines as i regularly bang mine off the limiter which is well over 7k... If your setup is very rich on the mid range regular oil changes are a must for long life, i change mine every 2k or even after an event if its been used hard.
I haven't even done 2k since buying it and Iv redone all the oils the waters everything. The main probs I can see was the oooodles of fuel it's been running. My bad I know.. Re build it my self I wouldn't have a clue.. I could get the bible out I guess.. I'm just going to leave it for a while then strip it right down. There was a bit of scum but after a journey that vanished. No crrap on the dipstick but some in the rocker.. I just put it in the garage after yesterday and when it started I couldn't hear it then 1500 revs it was there again. It's strange no loss of power just noise.. BugginRebuild it yourself
Ill bet the failure was down to poor oil pressure and very thin oil due to bore washing, revs dont kill these engines as i regularly bang mine off the limiter which is well over 7k... If your setup is very rich on the mid range regular oil changes are a must for long life, i change mine every 2k or even after an event if its been used hard.
Engine guys would you say do the inspection with the engine in or should I just take it out and start again?
Is you oil level good? not over full/empty
My pressure is off the scale then returns to 4 then 5 we had the turbo feed of last night and that pumped into a cup just fine and the oil looked good to me no contaminants.
Maybe try draining the oil and see if theres any silver or fuel in oil then take sump off and have a look at shells and see if cranks floating thats what i would do but i am no expert on car engines
Pull the lot out and check it over. I definitely wouldn't rely on the standard oil pressure gauge matey.
Pull the lot out? You mean all the internals? Or you mean take the engine out?
if you are not in a rush/can use another car as a daily, take it out and rebuild it propper in your own time
its a great opportunity to build a strong engine to the spec you want.
I built my first engine over the winter months - and tbh I thoroghly enjoyed it and learnt so much along the way - cant beat a day in the garage working on the 5(unless you are driving it)
All the info you need is on here or in the haynes... DO IT
Do it. As said you will learn so much
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