29 replies to this topic

[mini danny]

Just had spark plugs out first 2 sooty with chocolate coloured tip 3 all sooty and 4 was white i had ran it on slight choke and turned choke off and ran for another 20 secs after before checking here a pic of cylinder 4 plug




Danny

[mini danny]

Just been out to get video is only making the noise now under load might sound wierd but could it be clutch as the bitting point is quite high always has been


Thanks Danny


http://static.photob...23-08-04-13.mp4

Edited by mini danny, 23 November 2011 - 08:16 AM.

[Gulfclubby]

Has the timing slipped and what you describe is actually pinking? Have you examined the distributor since the initial event?

[mini danny]

Nah i haven't yet i rang mmc and they said they had this loads of times its the head gaskets apparently so gonna strip it down and check if no visable damage will change gaskets and refit and see what happens

Danny

[Frisco]

That sounds very bottom end mate.

[mini danny]

Ya i was thinking that but the noise from the top of the engine not the bottom and woundnt explain the loss of power if it was bottom end if i put my foot down it just won't pull

[Stevie W]

When a head gasket goes between cylinders it can give just that sort of noise as the "explosion" from one cylinder can "blow" across the broken gasket section and hit the top of the piston coming up the cylinder. Wouls aso account for the sudden loss of power/performance.
The sound given off by this happening sounds like severe pinking/detonation. If the noise is deffo coming from the top of the engine it could be piston problems.

However, by the same token, it could be big end problems although these tend to come on gradually with lowering oil pressure and a "harsh" feeling engine. As others have said, time to whip off the head and see whats going on.
Post up some piccies of what you find.
Cheers,
Steve.

[Frisco]

Its time to stop running the engine anyway, if its a big end gone then it could easily throw a rod and destroy the engine and box.
Taking the head off is easy so start with that anyway

[mini danny]

ya im not running engine stopped running it after the video strip down tomorrow and have a look im hoping its the gasket ill post piccys up tomorrow of everythink danny

EDIT: would you say ild be ok to run a conpresstion test today ?????

danny

Edited by mini danny, 23 November 2011 - 03:26 PM.

[Frisco]

It should be fine since there is no load on it but it does depend on how long its been happening

[mini danny]

I decided not to and have striped it down in dark so decided probz not best idea to actually remove the head in the dark so can wait till tomorrow will post pics of my finds


Danny

[mini danny]

Changed head gasket today really please with my self got power back and noise has gone





And checked all valves and all good

thanks everyone for your help

[Sam Walters]

Between 2 and 3? That was not the noise i was expecting at all! In fact i know what that noise sounds like on a 998! I also know what it sounds like on a full race 1293. Not a nice noise at all!

[se_juggles]

id just go caveman on its ass and hit it... works with the tv!

[mini danny]

Haha go caveman lol and 3 and 4 where fine still got gasket will post more pics up later