Forum Replies Created
-
Replies
-
Engine reassembled with new tappets shimmed to the cam. Cam checked for bearing ware. New water-pump, cam belt, drive belt and engine mount.
The sound remains. I’m not sad I did the work because the cam belt I removed had a tooth starting to brake off so I might have saved myself a catastrophe there. Also pulling away in first gear is much smoother now the worn engine mount has been replaced. Car drives wonderfully now… except the annoying tapping / clicking sound from cold.
So I’m starting to think it may well be piston slap as suspected by a couple of you earlier. Prior to giving up though, I will try to remove my injectors (always really stuck in!) and see if that is the cause. If the problem is piston slap I’ve got a tin of Ametech Engine Restore to use which I have heard very positive things about.
I need to correct myself earlier too. I said that if the noise was piston then it would be at the speed of engine rotation (about 13Hz ) but it may be the piston slap only occurs on the combustion stroke which would make it sound slower.
Engine reassembled with new tappets shimmed to the cam. Cam checked for bearing ware. New water-pump, cam belt, drive belt and engine mount.
The sound remains. I’m not sad I did the work because the cam belt I removed had a tooth starting to brake off so I might have saved myself a catastrophe there. Also pulling away in first gear is much smoother now the worn engine mount has been replaced. Car drives wonderfully now… except the annoying tapping / clicking sound from cold.
So I’m starting to think it may well be piston slap as suspected by a couple of you earlier. Prior to giving up though, I will try to remove my injectors (always really stuck in!) and see if that is the cause. If the problem is piston slap I’ve got a tin of Ametech Engine Restore to use which I have heard very positive things about.
I need to correct myself earlier too. I said that if the noise was piston then it would be at the speed of engine rotation (about 13Hz ) but it may be the piston slap only occurs on the combustion stroke which would make it sound slower.
I’m guessing most of you will not have had the chance to see many European engines so here are some images of working on my engine (1.9L diesel turbo) to change the tappets / cam follower buckets. It’s a single overhead cam. Basically cambelt off, water pup out, belt tensioner out (changing both), engine mount off, fuel pump off, vacuum pump off, cam-shaft cap beam off, camshaft out, tappets out.
I’m guessing most of you will not have had the chance to see many European engines so here are some images of working on my engine (1.9L diesel turbo) to change the tappets / cam follower buckets. It’s a single overhead cam. Basically cambelt off, water pup out, belt tensioner out (changing both), engine mount off, fuel pump off, vacuum pump off, cam-shaft cap beam off, camshaft out, tappets out.
I’m going to try changing the tappets. One has a slightly larger gap than the others between it and the cam (about 5 thou bigger). The others have some wear marks too. I need to do the timing belt and coolant pump anyway.
I figure given the speed of the noise it is most likely a tappet because in that video the engine was idling at 800RPM so if it were on the crank that would have a repetition of around 12hz. If it were a piston it would either be about 12Hz if it made the noise going up and down or if it were only in one direction of the stroke it would be about 6Hz. In this case I think the noise is more like 3Hz so I am thinking it is a tappet. Does that make sense?
I’m going to try changing the tappets. One has a slightly larger gap than the others between it and the cam (about 5 thou bigger). The others have some wear marks too. I need to do the timing belt and coolant pump anyway.
I figure given the speed of the noise it is most likely a tappet because in that video the engine was idling at 800RPM so if it were on the crank that would have a repetition of around 12hz. If it were a piston it would either be about 12Hz if it made the noise going up and down or if it were only in one direction of the stroke it would be about 6Hz. In this case I think the noise is more like 3Hz so I am thinking it is a tappet. Does that make sense?
Hi,
Good questions. The engine stopped itself when it overheated. I’m not sure if the ECU stopped it (I hope so) or the engine just stalled from the friction. As there was no water in the system the coolant temp gauge showed a reasonable temperature.
The oil vapour was directly after the overheat from under the bonnet, there is none now the coolant system is repaired. It is hard to say where it was coming from but I think mostly caused by vapour from the oil condenser that then feeds oil vapour it can’t condense into the air inlet pipe, through turbo, intercooler and to the inlet manifold. All of this had oil on it after overheating. When I took the air inlet pipe off the manifold there was vapour coming out the inlet manifold on the top of the engine so the top of the engine was obviously very hot indeed.
However, I don’t think this clacking sound was quite so apparent until after the 300 mile drive home on thin oil following the overheat and coolant system repair. I’m thinking something was stressed by the overheat then worn even more by running for a long time on thin burnt oil.. but just what part is worn I don’t know?
The coolant from the burst pipe just fell down the back of the engine on the block and a little on some other pipes engine mount etc.. nothing to make a clacking sound I think. I don’t see any oil vapour or smoke from the engine now and on the drive home I was getting good economy as high as 62mpg, I just have this remaining noise.
Hi,
Good questions. The engine stopped itself when it overheated. I’m not sure if the ECU stopped it (I hope so) or the engine just stalled from the friction. As there was no water in the system the coolant temp gauge showed a reasonable temperature.
The oil vapour was directly after the overheat from under the bonnet, there is none now the coolant system is repaired. It is hard to say where it was coming from but I think mostly caused by vapour from the oil condenser that then feeds oil vapour it can’t condense into the air inlet pipe, through turbo, intercooler and to the inlet manifold. All of this had oil on it after overheating. When I took the air inlet pipe off the manifold there was vapour coming out the inlet manifold on the top of the engine so the top of the engine was obviously very hot indeed.
However, I don’t think this clacking sound was quite so apparent until after the 300 mile drive home on thin oil following the overheat and coolant system repair. I’m thinking something was stressed by the overheat then worn even more by running for a long time on thin burnt oil.. but just what part is worn I don’t know?
The coolant from the burst pipe just fell down the back of the engine on the block and a little on some other pipes engine mount etc.. nothing to make a clacking sound I think. I don’t see any oil vapour or smoke from the engine now and on the drive home I was getting good economy as high as 62mpg, I just have this remaining noise.
Thank you for your quick reply.
I should have been more clear; the coolant issue was solved it was a burst pipe, simple as that. However there is obviously some wear from the experience.