What happens if a Porsche 911 valve is too tight?
This prevents wear on the tip of the valve. If the clearances of valves are too tight (not enough space), then you can have valves that don’t completely close. This can cause leaks through the valves during the motor’s compression and/or power stroke, which results in significant power loss, and in some cases can cause engine damage.
Where can I get a Porsche 914 workshop manual?
Copies are seen on Ebay from time to time, and there is the “PIC” CDROM catalog that also shows up on Ebay. “Porsche 914 / 914-6 Factory Workshop Manuals”, (FWM) from Porsche, revised 11/17/1981. NLA.
Where is the clearance on a Porsche 911?
Figure 2 shows a close-up of a valve and rocker. The clearance that needs to be adjusted is located between the valve tip and the rocker arm adjusting screw. This screw has a little swivel foot that rotates to meet the valve stem flat. This prevents wear on the tip of the valve.
How are exhaust and intake valves actuated in Porsche 911?
The exhaust and intake valves are both actuated by a set of rockers (#17 & #19) which open the valves by riding on the camshaft. In their normal position, the valves are sprung closed by the valve springs (#16). When closed, they make a tight air seal with the valve seats that are pressed into the heads.
Do you need to manually set rear pads on a 914?
Because of the parking brake and it’s action on the rear pad, you need to manually set the clearances of both sides of the 914 rear pads. Unfortunately, the mechanism for doing this was not very well designed, and in addition, the brake parts often rust out and strip on these older cars.
Where can I find details on the 914 brake system?
Details on bleeding the 914 system can be found in the Pelican Technical Article, 914 Brake Bleeding. The front pad replacement is easy compared to the rears. The addition of the parking brakes seems like an afterthought with the design of the 914 calipers.
Do you need parking brake on Pelican 914?
The addition of the parking brakes seems like an afterthought with the design of the 914 calipers. Because of the parking brake and it’s action on the rear pad, you need to manually set the clearances of both sides of the 914 rear pads.