20-01-2013, 09:02 PM
Hello mate
Right there is two reasons why a GTi can tap. One not so bad, other bad!
First, tappetts. They are very sensitive to the right oil and can sometimes get stuck. I would start with a flush of fresh oil, let it climb to temperature then take it out and rag the tits off of it.
Second and worst, damage to the head. Due to the oversize valves in the gti, it doesnt take much error in valve timing to clip valves and bend them. The tapping you can hear is the valve not hitting the cup square on. Sometimes they can work happily for years and years like this but every time the valve reseats, it bends slightly and over time cause the stem to weaken until finally the head snaps off in the bore destroying your engine.
If it is because of this, its basically new head time.
Edit: oh and before you go ahead and replace the head after ragging it, if that doesnt fix it, have the cams out, take the tappetts out and just bang them all out on a worktop, reassemble, fill with good quality oil and retry
Right there is two reasons why a GTi can tap. One not so bad, other bad!
First, tappetts. They are very sensitive to the right oil and can sometimes get stuck. I would start with a flush of fresh oil, let it climb to temperature then take it out and rag the tits off of it.
Second and worst, damage to the head. Due to the oversize valves in the gti, it doesnt take much error in valve timing to clip valves and bend them. The tapping you can hear is the valve not hitting the cup square on. Sometimes they can work happily for years and years like this but every time the valve reseats, it bends slightly and over time cause the stem to weaken until finally the head snaps off in the bore destroying your engine.
If it is because of this, its basically new head time.
Edit: oh and before you go ahead and replace the head after ragging it, if that doesnt fix it, have the cams out, take the tappetts out and just bang them all out on a worktop, reassemble, fill with good quality oil and retry
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft