Replacing Manifolds?

I think the previous owner of my boat (2000 Supra - yes I know not a CC) used it in brackish water from time to time (had a flush kit). One thing in the back of my mind is the exhaust manifolds. I have removed some heavy rust call off the bottom exterior of the manifolds, but they appear solid once the scale was removed and they do not leak. Also a couple of the bolt heads are almost all rusted away.

The boat runs great and does not overheat. Because of the fear of the unknown or having a mid-season repair with lots of down time, I am considering as a winter project removing the manifolds and checking them out. I am sure getting the manifold bolts will be a challenge.

I am guessing it is not common for manifolds to have heavy rust scale on the bottom, but I am looking for a little advice if I should take it apart or leave it alone?

I agree with macs81sn. An inspection only gaurantees they are good at inspection time. I would also suggest you just run it and enjoy it. I suspect the boat was used in salt water a good deal to be that rusty. Here is the engine in the 93 Supra I currently have under my wing for comparison..

Hmmmm, where would I find my Pro-tech? Is that what they call this PCM engine?

Pete is spot-on. In the early 1990's, PCM came up with the ProTec Electronic Engine Management System. The components of ProTec consisted of a combined computerized control module and coil assembly, sensor (trigger) activated by an interrupter timing system (which replaces the conventional distributor), a new wiring harness, 8 M.M. silicone ignition wires, temperature and oil switches and a knock sensor. (Your sensor "trigger" is that thing that looks like a big hockey puck where your distributor would normally go)

PCM used this system on many engines between 1990 (I think) and 1994. The ProTec system was also used in the first PCM offering of throttle-body electronic fuel injection (1994).

Many people consider the ProTec system to be a "ticking time-bomb" as they are prone to failure -- often without warning. Symptoms may include hard-starting, poor engine performance (as one or more of the coil packs are failing). engine running in "limp-home" mode, or engine just quits for no apparent reason. Parts for ProTech are NLA (no longer available).

Something for you to look forward to...



JQ

Thanks for the education guys, you have my attention. I have seen Pro-Tech mentioned on the forum before but never bothered doing any research since it didn't apply to me.....until now. This must be very relevant to CCs as well as other manufacturers, I would guess there are a lot of these enginesut there. I would think it would be an easy and inexpensive fix to replace the trigger assembly with a DUI distributor. Is there something more to it than that? This boat has about 430 hours on it and has never had a problem, but I suspect it is like most electronic components and doesn't have a problem until it does. I will keep a tow line handy. I am just the guardian of the Supra TS6m. It belongs to my nephew who got it new for his 16th birthday. It has been in storage much of its life. He does his water sports these days behind a boat more appropriate to this forum.

desertskier has mentioned low voltage contributing or whole heartedly causing failure. A comparison would be welded starter solenoid due to corroded battery cables.