An exploration of a Type 4 motor

[snoeckie]

oh okay cool, yeah it has the square ports cant wait to get that thing apart just worries as to what i might find inside, the "forget me nots" were missing and the actual exhaust if u look inside the port is a silvery colour as apposed to the other 3 black ones

[stew 89]

Hey thats my wary too... But you know what its an old motor some poophol probably didn't look after it so there will be problems. go into it knowing you probably going to need a new cam and set of followers. and by new i mean out the box. otherwise enjoy. I have some more picks just need to load them. also my busses motor is out now so the side project will take a side line for the time being.

[stew 89]

Up date:

Ok so next I went to removing the oil pump. the big difference is that the T4 is a stand a lone unit that is held together with 4 bolts on the back side where as a type1 is a cace with a face plate mounted in the case.
First brake the torque on the three case bolts around the pump then undo the 4 bolts holding the pump in.



then use the ears to slowly pry the pump out



undo the 4 bolts on the back of the pump and separate the pump.



here you can see the pump gears the one on the shaft is the drive gear and like the T1 gets its drive from the Cam the other is a coster gear and gets its drive from the drive gear. some people recommend replacing the T4 pump with a T1 pump I don't know why or if it would make any difference on volume or pressure.



here you can see the o-ring that seals the pump there should be a replacement in your gasket set.



the marks made by the gears. the gears look to be quite roughly machined so I don't think these marks is a problem



here is some wear on the tab of the drive gear that fits in the cam



next is the other head once i removed the springs i saw this its a broken peace of the head at the velvet guid on the exhorts port that dropped the valve in the past. can you see it?

[snoeckie]

Hey thats my wary too... But you know what its an old motor some poophol probably didn't look after it so there will be problems. go into it knowing you probably going to need a new cam and set of followers. and by new i mean out the box. otherwise enjoy. I have some more picks just need to load them. also my busses motor is out now so the side project will take a side line for the time being.

yeah thats the thing, anyway i got a chance to strip it and its not looking good reason for no compression on cly 2 was a valve seat that came loose n stuffed something up in there and further stripping revealed that the gudgeon pin on one of the other pots came loose or was never put back scored the bore so badly that it cannot be used again so looks like a complete rebuild. not too sure where to get spares for this thing in durban

[stew 89]

Im also A durban boy. I get most of my parts from Rui (Calookers) here on the forum. His service is really good and he knows what he's talking about. I just got a set of new pots + pistons from him. Drop him a PM.

[snoeckie]

okay thanks for the advice, ill give him a shout wana get this thing running just sitting on the bench now