What are those 4 screws no this 3.0?

[1ricardo]

Dear Friends

I would like to know what are these 4 screws ( and I just red circle 2 of them, the top ones) on rear and the left hand side of this 1983 3.0L engine block

Mine are badly corroded and today i unscrew one and notice that its not just a bolt, it's long and looks like a pin or something, it has a aluminum crusher washer on it

Also I would like to know if I damage or misaligned something when i made this exploratory removal


Regards

[jpnovak]

cam chain ramp fixing bolts. You risk issues with the cam chain alignment and support ramps by moving those bolts. By pulling them out the plastic ramp becomes distorted and my not fit tight.

NOw you need to pull the cam chain cover and replace the ramps.

[DRACO A5OG]

or Worse broken plastic pieces inside the engine. That rust in only surface rust.

[brighton911]

Just to echo the first two guys, you must at minimum, install new chain guides. The risk of not doing it could be a very expensive repair.

[Dpmulvan]

Stop exploring!! Without a manual, at least the motor is out of the car.

[Pazuzu]

Originally Posted by DRACO A5OG

or Worse broken plastic pieces inside the engine. That rust in only surface rust.

Probably not even that, IIRC mine had a dark bronze coating on them that could look like rust, but wasn't. I expect that since they are designed for lateral pressure not axial pressure (ie. it's not a bolt) it might be some special alloy with a strong coating for corrosion protection.


It's possible that the chain ramp didn't move, and putting the pin back in will be fine, but he'd have to do some exploring to verify.

Actually, test is this:

1) Try to put the pin back in. if it only goes in about 1-2 centimeters, then the ramp is blocking the hole and you need to open things up.
2) If the pin goes in more than that, do you feel some tension putting it in, like you are passing a spring loaded detent? That is good, since the chain ramp does have that.
3) If you put the pin back in and it just slides all of the way in without any tension, then the ramp has shifted away and you will need to open things up.

[Tippy]

Originally Posted by Dpmulvan

Stop exploring!! Without a manual, at least the motor is out of the car.

If he removes the chain housing covers, he should remove the big nut off the camshaft and see what it does too.



Just kidding, don't do that. A joke

[1ricardo]

Dear Friends

Thank you all so much for the input! I'm so sad and embarrassed that I messed up with this bolt...Anyway, now it to late

Let me just give you all more info

The engine still in the car (the pictures of this engine was a file picture for demonstration poorhouse)

I understand that now i must open the chain cover to double check if its assembled right and once its opened change the plastic chain guide, but...

I actually just unscrew 1 screw (the bottom left side the that I circled on this new pictures)

And when I reinstall the bolt it went well all the way in, but at that time I did not paid attention about the a tension against the bolt.

So my new question is, when I remove just this one bolt, it possible that the chain guide shifted?

And now that I'm screwed already, just open again this bolt and try to reinstall it trying to feel this tension?

Thank you all again

[Tippy]

With the chain housing cover off, you can inspect and see what you are doing while reinserting the chain rail.

Might as well take both bolts out on the rail, remove the rail, and inspect the holes the bolts went through. I broke 1 removing on my last teardown. Easy to do. Luckily, they're only $6 a piece.

[Dpmulvan]

Removing the chain housing cover with the motor in the car with engine tin installed must be a major pain in the ass!!!

['76 911S 3.0]

Originally Posted by Dpmulvan

Removing the chain housing cover with the motor in the car with engine tin installed must be a major pain in the ass!!!

Really not that bad once you remove the rear tin, which is also not all that bad to take off either.