Genuine 1991 Volkswagen Transporter Cylinder Head

1991 Volkswagen Transporter Cylinder Head Parts and Q&A

• Q: How to properly install pushrod tubes and cylinder heads to prevent oil leaks and ensure a secure fit on 1991 Volkswagen Transporter?

  A: In order to remove the rocker arms of the shaft, the spring clips on each end would be removed as well as thrust washers and wave washers, and the end rockers can be removed. Under the condition that the rocker shaft support pedestals are tight, then they might be tapped off so as to reach the two inner rocker arms, clips and washers. It is recommended to place the components in the sequence of disassembling in a stable place. In order to remove the valves, a suitable instrument is needed to compress the valve springs which are almost at the same level with the edge of the head casting. In case a G clamp having longer ends is not available, a short length of tube with an opening cut into the side may be employed to reach the split collets on the valve stem with a traditional spring compressor. Once the spring is compressed, small screwdriver may be applied to remove the split conical collars of the stem of the valve, without losing a grip on the spring clamp. After the spring retainer collar and spring have been removed, any little sealing rings on stems of valves ought to be removed, and then the valve may be forced through the guide. In case of valve sticking, it can be as a consequence of carbon or sludge deposition, which ought to be rinsed and any burr on the valve stem ought to be neatly stoned off without scoring the guide. The replacement of the valves should be taken organized in order to be used in the same port, with a numeral piece of cardboard. Once the cylinder head and valves are stripped off, the head is to be polished in order to check it of carbon as well as to check it against cracks especially on the valve seats or spark plug holes. In case of cracks, the head must be scraped and an evaluation on whether to buy a new, fresh head or buy a used one which is in a better condition should be considered. In case the head has been blown off in between of the head and the cylinder, then it could be because of the wrongly tightened head studs and nuts. In case of no indication of intense burning, the cylinder may be light ground with carborundum paste such that the depth to the bearing surface of each cylinder is the same so as to avoid leakages. Checking Valve seats must be either burning, pitting, or ridging, slight pitting can be treated with grinding in the valve using carborundum paste, or severe pitting could need re-cutting of the seat. The rocker gear must be removed and wiped with sludge and the rocker arms must slide on the shaft without play since too much play can cause engine performance problems. Wear should also be checked on the valve clearance adjusting screws. The valves should be cleaned of carbon, the head of the valve should have no cracks or pitting and the seating edge should be unpitted and unridged. The movement of the valve out of its guide during replacement is an indication of wear, and the allowable sideways motion is a 0.8 mm rock, which is not easily doable and a dealer should be consulted instead of trying to do it on one's own. Lastly, the point where end of the valve stem carries a rocker arm should be flat, which may turn to be concave or ridged and special caps or grinding using a fine oil stone may be applied to shape it again since it is hard to set the valve clearance correctly when the valve stem is damaged.