1977 308 Engine woes

GT Car Parts in Phoenix had complete used engines for sale at one point.


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At 16k miles... wow are these cars really that delicate?

 

While you're in there, change out the sodium valves.

 

Take the engine apart before you go buying anything. The block might still be okay.

 

Exactly.
Teardown and inspect. Very likely just need new liners instead of a new block.

 

I'm confused as to what caused the failure then if the sodium valves were replaced before the failure

 

Ouchy. Looks like a forged piston too so we know it's been gone through once before. If I remember right these are an 18mm pin size, not very big, wonder what caused it to let go.....

 

Is that a OEM piston ? If not what’s the rationale behind swapping them out please ?

 

I'd guess the zooomies, the 308 series engine has virtually zero dwell. That should really be accounted for when updating the engine. Or it simply has a bad part or incorrect rebuild step on that cylinder.

 

Without seeing the entire motor the only engine I saw looking like that broke a rod near the big end, crank came around and collected the rod, broke pin and rod out of piston and stuffed it through the cylinder wall. Block might be salvageable but nothing else below the head gaskets will be.

Bad break.

 

Well we certainly both have justifiable misgivings about Ferrari factory rods but my money is on this being an act of human intervention.

 

I do not believe "the pin let go" was the initiating event. Pins do not rip out of pistons. They get ripped out of pistons.

 

Still stands, the piston let go of the gudgeon pin. As to why? Could be the last guys error or the piston had internal faults, kinda doubt that.. But never know. Heck the piston could have seized to the bore and the pin/rod just kept going.

 

The block might still be usable, the o-ring sealing surface would be the first thing I want to see but I suspect it would be okay because the hole is above that. A little dremel work to clean up the cosmetic carnage might be all thats needed.

 

Have to be a Chinese piston for that. Seen lots of seizeing pistons just drag a motor to a halt and not rip a pin out of it. And the liner has no indication it was sticking a piston. Does not really matter now.

We are not talking about a blown fuel motor here. Its 200 some odd HP.

 

Is there any play in the other small end rod bushings? Do the other pistons rock a bit on the pins? Like shown here?

https://youtube.com/shorts/rFbD17jbn0s?si=CKSvzeNpUWEDMrRk