another question for my build is about aftermarket/oem cranks. Due to my front and rear main seals going out after less than 1000 miles I believe my crank MAY be bent/warped. Are their any suggestions on replacements if it turns out to b bent? Like maybe buying an oem and having it knife edged? Or a good aftermarket crank?
7m crank?
- Thread starter turbo87targa
- Start date
Stock is forged steel. There is none better. Bent isn't likely, but I suppose possible. In fact, I think the 1500 hp 7M dragster uses the Toyota crank.
Do you know how to measure a crankshaft?
Do you know how to measure a crankshaft?
I will have it inspected when it's all pulled apart.
Is there any other causes for why my mains would be going put like that?
Is there any other causes for why my mains would be going put like that?
Check your crankcase vents, the steel tube,
and the pathway into the throttle body.
I have seen these plugged solid on the 7M,
and then they will push oil out at the point of least resistance,
such as the crank seals, or cam cover gaskets.
and the pathway into the throttle body.
I have seen these plugged solid on the 7M,
and then they will push oil out at the point of least resistance,
such as the crank seals, or cam cover gaskets.
Have you ever noticed your dipstick "popped" before? If you have a pcv issue thats the first point of relief.
Indeed it is the first common point of relief for the crank case pressures. The oil dip stick is the first place, and some people ( i know about it on other turbo cars, not so much the 7M from experiance ) will use a zip tie and a small hose clamp or something like that to hold the dip stick in place. Chances are you have a clog in your PCV system. If you pull your valve covers and clean the nipples there (off the car) with carb cleaner to get all the deposits of oil and carbon out of there, you can clear it up. Then also clean the metal lines and the one to the throttle body. The carb cleaner will not harm your engine, just dont get it into your oil, because it will harm that and you bearing surfaces. You can use engine brushes to clean out the crank case evac holes as well. Make sure you dont break one off. Easy to check your crank to see if it is warped, is to measure each opening with a micrometer, and make sure they are equil at both sides. Like where the caps are, and then the farthest place from them. Its possible the seals blew out because your crank is warped, but unlikely. Its normally a pressure build up that would blow a seal, if not dry rotting.
Time to drill out the valve cover ports for some bigger ones. Pull the alt and check the port from the block to the valve cover. Make sure there is a source of vac from the tb port AND from a pre turbo connection. Do you have a catch can?
DONT tie the dipstick down, dumb thing unless you like replacing those seals again and again until you solve this.
DONT tie the dipstick down, dumb thing unless you like replacing those seals again and again until you solve this.