how hard is it to replace exhaust manifold??

Answer 1

It is not "technically" difficult but it is exhausting and you can do serious damage if you do it incorrectly and allow debris or coolant to get into the engine. So you should have someone who has done it before give you a hand.
If you have to change them they are probably rusted through which means the bolts will be very difficult to remove. Start soaking them with a penetrating oil several days before you intend to remove them and be ready for a fight. I ended up grinding off the heads and sliding the manifolds off, then clamping vise grips on the shafts to get mine out. Not fun.
It is often recommended to replace the risers at the same time. Everything you need can be ordered as a package just be sure to get the gaskets and mounting bolts as well because you will most likely need to replace them.

Answer 2

If this is a marine application, it is a little more involved. The manifolds on marine engines are normally water cooled and there for require the coolant to be drained from the engine.

However, it isn't a terribly hard task. Just pay close attention to detail and if you have a question, get in touch with Cummins or Caterpillar marine dealers...they can definitely help.

If you aren't a mechanic by trade, I recommend getting with an experienced mechanic. On engines that are used, you could open a can of worms that you aint willing to eat!

Answer 3

It depends on the boat, but generally speaking it is a pretty straight foreward task. I don't know what your level of experience is, but if you can change the exhaust manifold on your car, you can probably do it on your boat as well. Use lots of penetrating oil on the nuts and studs. Soak them with it for as long as possible prior to disassembly, otherwise you will probably break them all off which will make the job a bit more difficult. You can expect them to be rusted and frozen, especially on a boat, although if you are dealing with a water cooled manifold they may not be quite as bad. As with all exhaust related fasteners the heat speeds up the rate of oxidation so they can become very difficult to remove in one piece. Use a good penetrating oil like Kroil or PB Blaster, NOT WD-40, It's useless as a penetrant.

Answer 4

The exhaust manifold is hung on via some bolts into the engine block. Its a fact to un-bolt them, scrape off the previous gasket and positioned on the recent one, inspite of the shown fact that there must be worry in 2 places. First you should loosen the exhaust further returned interior the automobile so which you would be able to circulate the manifold sufficient. 2nd the bolts may be nicely rusted into place by using extremes of warmth they experience, you dont want to interrupt those, so soak it with wd40 for some days in the past you attempt to do the job, basically keep a can interior the automobile and spray the bolts each few hours. some days of which will loosen maximum bolts.

Answer 5

I need more info before I can give you a reasonable answer. What type of vehicle is it car truck van? What size engine dose it have? Inline 4, V6, V8. Is it automatic or standard. Front wheel drive, rear wheel drive, in some situations it matters since front wheel drives use a transaxle instead of a transmission that is used in rear wheel drive vehicles and four wheel drives even all wheel drives vehicles.

Next would be are you mechanically inclined? Meaning do you work or have you worked on automobiles? Doing a simple oil change dose not really count but at least it’s a start. By your question it’s difficult to tell if you have ever done anything on a vehicle no offence but you should have told us what type of vehicle it is.

OPPSS I see your talking about a boat well I have no clue if its a boat.

Answer 6

Depends on a car. In some cars there's so little room to work, you cannot fit a wrench in there, so it's very hard. On some cars it's easier.
On a scale of 1 to 10 of auto repair, this will be a 4.
I'm sure some people here will say they did it within 10 minutes, and some people will say only a mechanic can do it.

Answer 7

you are asking this Q in the "boats" section ---- are you replacing a boat of car muff ---- if you are trying to fix a boat muff then it is too tuff to do at home --- unless you are well versed in the system -- does your boat have the fresh water or sea water type muffler and if so you can ask yourself this one Q "CAN i R&R the muff and still have no water leaks"" answer that to yourself and decide if you can do the work at home... if it's the car just take it to the muff shop and get it done and pay the guy __ it is cheaper than having a carbon monoxide poisoning inside your ride..... ............

Answer 8

Someone experienced really should be the one to do it. Especially if you have NO CLUE as to how to fix it yourself.

Answer 9

undo some bolts change gasket put bolts bak in