Checking Manifolds

[GetOnIt]

How can I check my exhaust manifolds and risers to see if they are still good? Is there a pressure check or someway to test them?

 

[Scaaty]

Re: Checking Manifolds

Best check after 4 years on salt, replace, 8-10 in fresh. Zero way to tell when they will rust through just after you pressure test anyway.

 

[trebor0301]

Re: Checking Manifolds

Sorry to jump in but,what do you mean rust thru?Are we talking about a hole?

 

[Scaaty]

Re: Checking Manifolds

Yep... water jackets rust from the inside out, letting cooling water that runs through them and out with the exhaust after the manifold riser, now leak into the exhaust ports, through the exhaust valve, into the the combustion chamber.

 

[rodbolt]

Re: Checking Manifolds

just replaced a set on a 99 volvo 5.7GSI. engine hour meter shows 274 hours. another 3 months and the engine would have been junk. the center ports on both heads were already being water damaged. they had started leaking. the oil pan had rusted a hole through it and the circulating water pump had rusted and swelled until it was actually rubbing on the balancer. had to use oxy/acetylne on the upper and lower mount nuts to remove them. man aint salt water great .

 

[Scaaty]

Re: Checking Manifolds

Getting ready (I pulled back muscle just SNEEZING at a bent over angle-so I'm in the chair) to do a whole new set on manifolds on my 350. When the right side let go, it sounded like a valve ticking, but more of a sharper crack. Went back up to the house, and was going to do a compression check for starts, and pulled the plugs. Looking back after cranking a touch, I was blessed with a bunch of water shooting out of the spark plug hole. Drained the block and pulled the raw pump belt. Stopped while cranking. Pump back on, blocked off the offending man, and no problem. Water back to man, and whoosh...Did get some water (yeah, I just love salt) in the oil, but a bunch of changes and I hope we are good to go.