Replacing Exhaust Manifolds on Twins?
04-06-2018, 09:09 AM
#1
Registered
Thread Starter
Replacing Exhaust Manifolds on Twins?
My manifolds are leaking (rusted through) so I need to replace them. Trying to decide if this is a job I want to tackle myself. I'm mostly concerned with the two inboard ones as they are pretty tight. Have you guys done it? How hard is it? Is it less work to pull the motors, or at least one of them?
04-06-2018, 09:21 AM
#2
Registered
Not very difficult. Pull risers. Pull cooling hose. Then 8 bolts. However if they are that rusty the bolts could be in bad shape also. I had to grind some of the heads off mine but motors were out of boat so much easier.
04-08-2018, 10:44 AM
#3
Registered
You're engine's are much closer than mine, I can remove my bench seat in 2 mins. for even more access and I paid a mobile mechanic $850 to do the work. Very glad I did after seeing the BS he had to go through. I did Y-pipe flappers at the same time while the components were off, cheap insurance.
Keep in mind the manifolds aren't held in place with studs (at least not on mine) so you have to hold a 50 lb. slug while feeding in bolts and hope not to cross thread etc. You may also be battling hard to remove and potentially broken bolts. Not any fun in that cramped engine bay nor mine with more room.
Keep in mind the manifolds aren't held in place with studs (at least not on mine) so you have to hold a 50 lb. slug while feeding in bolts and hope not to cross thread etc. You may also be battling hard to remove and potentially broken bolts. Not any fun in that cramped engine bay nor mine with more room.
04-10-2018, 08:16 AM
#5
Registered
IMO a good cash layout for the work involved. If you have the time watch the procedure in case you want to DIY the next time. My mechanic threw my port starter in at the same time as it's much more accessible with the exhaust off and was cranking slow as well. He said it can be done with the exhaust on, must be a magician.
04-10-2018, 10:01 PM
#6
Registered
Holy moly this thread makes it sound like your trying to enrich uranium.
They are log headers...it’s 8-12 bolts per manifold. Figure it out just like a shop would. Think we’ve had ours off and on 4-5 times last year. Takes 20-40 mins.
They are log headers...it’s 8-12 bolts per manifold. Figure it out just like a shop would. Think we’ve had ours off and on 4-5 times last year. Takes 20-40 mins.
04-11-2018, 09:22 AM
#7
Registered
Like you said 1 rusted bolt turns the 1 hr job into all day, Been there and just did that. In the end I had to pound a 13mm, 12 point socket onto the head since the rust actually made the head of the bolt smaller. Took me 3-4 hours to remove 1 manifold. I also had one engine already removed so i had working working room.
Always comes down to time and money. Some people have more time less money, others have no time but more money.
Always comes down to time and money. Some people have more time less money, others have no time but more money.
04-12-2018, 03:03 PM
#8
Registered
Like you said 1 rusted bolt turns the 1 hr job into all day, Been there and just did that. In the end I had to pound a 13mm, 12 point socket onto the head since the rust actually made the head of the bolt smaller. Took me 3-4 hours to remove 1 manifold. I also had one engine already removed so i had working working room.
Always comes down to time and money. Some people have more time less money, others have no time but more money.
Always comes down to time and money. Some people have more time less money, others have no time but more money.
