Hi..

I have just taking my engine apart and now i found some cracks around the spark plug hole inside the rotor housing. There are 1 crack in the first housing an 2 cracks in the second housing just around the spark plug hole..

They are very small but they are there... I think they are 1 mm long but my question is if that is normal...???

Does the engine work fine or should i find some new housings...???

I have 4 housings in spareparts and there are cracks in all of them...???

I hope someone can help me with that problem..

Thanx

 

Can you post some pics?

 

Yeah showing pics can really help out a lot. Also, can you feel the cracks with your fingernail?

 

Hi..

The only pics i have is taken by my mobil phone and it is not a good pic. The sharpness is bad. I will try to take some picture soon...

Thanx for the fast reply...

 

from over tightening the spark plugs???

might need new rotor housings

 

Here is the picture taken by my phone..

The crack is in the left and right side of the hole... I dont think you can se it on this picture...

 

From what I've heard, that's pretty routine to have that. It has to do with the sharp edge around the plug hole and arcing of the spark. What some rebuilders do it so grind it down a little around the hole so it's not a sharp edge, but rounded to help that from happening.

 

Yeah more or less, just bevel the edge around the hole, it should suffice.

 

ok...

Thanx for the tip.. I just want to now if that was normal and what to do next..

Thanx again....

 

I have a friend whose dad had an 85 GSLSE and overtightened the sparkplug once and when removing for replacement the threads broke!! The crack was circular around the hole and brought the whole thing out with the sparkplug... He put it back the best he could and sold the car

 

Kind of like the Toyota truck my buddy bought. A routine spark plug change turned into a top-end engine dissassembly because the previous owner cross-threaded a spark plug. He was not too happy.

 

I've seen SOMEWHERE specs and info on cracking around plug holes. Like, if the crack is so long, you can't use it kind of deal.

Yeah, grinding the crack down a bit would probably do the trick. Big thing is that there's nothing for the apex seal to catch on - that could accelerate wear.

Dale

 

are these cracks caused by detonation?

 

Nope.