• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Testing exhaust manifolds for leaks...

Page Title Module
Move Remove Collapse
This topic is closed.
X
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Testing exhaust manifolds for leaks...

    That's one trick I've never heard of - pretty slick! Thanks for sharing it, Bubba. Sounds like it would be a bit easier than the way I've seen it done.

    My shop pressure tests the old-fashoned way- by blocking off the ends and attaching a hose with a special fitting. The fitting has ports for a pressure gauge and schrader valve. They put (I think) 20 PSI air pressure into it and check for leaks with soapy water and a brush. They do this (of course) after rodding out the risers and manifolds to clear any scale or rust, and then blowing out all the passageways.

    One thing to consider with using acetone- any rubber hoses it touches should not be re-installed on the boat.
    "Winter Dream"
    Silverton 34C
    White/Green

    Wellcraft 23 Nova XL

    Lowe 1448 BigJon
    w/Evinrude 25HP


  • #2
    I see a lot of folks asking for a simple way of testing their exhaust manifolds for leaks so I thought I would share a method I have been using for several years that is both easy and almost fool proof.

    Supplies needed.

    A short (12") length of water hose that fits the water inlet on the manifold. (You may need two lengths. See drawing)

    1 gallon of Acetone

    Hose clamps to secure the hose on the manifold.

    See the attached image below (ok, its crude but you get the idea) of a typical marine exhaust manifold. Depending on your manifold you may or may not have the optional water connection but they all have a single connection for the water inlet.

    If you have a second water port you must either attach a second hose (as shown) or cap off the port. (Either works fine.)

    Connect the water hose to the inlet on the manifold and arrange it so it is higher than the very top of the manifold discharge (the part going to the riser).

    Now with the manifold level, pour acetone into the hose until the manifold is full and the acetone is right at the top of the manifold. (Don't over fill.)

    Thats all there is to it. Let it sit for 20-30 minutes and look for any signs of leakage and for a drop in the level of the acetone. There should not be ANY signs of dampness (leaking) in the exhaust gas side of the manifold nor any leaking to the exterior of the manifold. If there is its time to buy a new manifold.

    But what about pressure to test it you ask? There in is the simplist part of all this, you do not need to apply any pressure to the liquid (acetone) side of the manifold for this to work. Say WHAT? No pressure? But, but, but...

    The reason is that acetone is VERY thin and has almost no surface tension compared to water. Water is 4 times as viscous (thick) as acetone and has a MUCH higher surface tension. (Surface tension is why you can fill a glass higher than its rim or why bugs can walk on water.)

    To give you an example, if you had a small opening (crack) that acetone will barely pass through, you would need roughly 20 PSI of pressure to force water through it. In other words the acetone will "leak" well before water ever would. Even if the water is under pressure from the water pump.

    If there is no signs of leaking, pour the acetone out (keep it) and flush the manifold with water and your ready to put it back on the engine.

    Hope some of you folks find this usefull.

    Locking and putting in the Adults Only sticky at the top of the forum.
    Last edited by Fun Times; April 16th, 2014, 05:24 PM.
    Don S.

    sigpic

    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

    Comment

    Working...
    X