please help....blew out the manifold

[holmesa81]

on a 90 hp merc, the manifold or intake that the carbs are bolted to blew apart on me. what would have caused this and how expensive of a repair is it? any help is appreciated, thanks

 

[vinney]

Re: please help....blew out the manifold

Connecting rod trying to get out of the block.

 

[holmesa81]

Re: please help....blew out the manifold

big problem? if i replace the manifold will it just occur again?

 

[vinney]

Re: please help....blew out the manifold

There is a bearing failure in the engine conn rod bearing.

 

[holmesa81]

Re: please help....blew out the manifold

is it a very complicated fix? or can i being somewhat mechanically inclined (i could replace the maniford no problem) replace the bad bearing?

 

[vinney]

Re: please help....blew out the manifold

big problem

 

[holmesa81]

Re: please help....blew out the manifold

as i understand it the connecting rod is actually within the block....this problem occured at the intake manifold. i know being that you cannot see it visualy you cannot be certain but couldn't it just have been a ignition of gas within the manifold as a result of cylinder not firing that caused the blow out?

 

[Hooty]

Re: please help....blew out the manifold

Holmesa my frien', it sounds like what has happened to your engine iz it has throwed a rod. That's a major malfunction. If that's the case, the best and easiest solution is to replace the engine. It may or may not be repairable.<br /><br />c/6<br />Hooty

 

[briannh1234]

Re: please help....blew out the manifold

The manifold is a matched piece of the block. To replace the manifold you must replace the block. I have heard of people welding the manifold back together.<br /><br />Check the garbage that came through the hole - it will be more that just the parts of the manifold. You will probably find parts of your connecting rod and wrist pin for that cylinder - Let me guess - number 3 cylinder?<br /><br />Don't throw your current engine away - take it apart and confirm what is wrong - then sell the parts.<br /><br />Good luck - I have a 135 head with the same problem that I will eventually sell for parts.