Always check continuity with a multimeter, especially when first installing.
You’d be surprised how often you WON’T have a good electrical bond, without cleaning, buffing, scraping the contact surfaces.
I also use a dremel and wire wheel in bolt threads. The white zinc oxide that often remains...
Here's a pic of my old GLM housing, and the new housing from Amazon which I believe is counterfeit; not just because it doesn't say "GLM" in the casting, or that it's missing the internal hole that allows the water from the drive to enter into the engine's circulation loop, but also there's...
I did have an issue one time, when I mixed GLM manifolds with Sierra elbows (or vise versa, I forget); there was a slight interference that prevented a good seal between the two, which wasn’t noticeable until I realized I couldn’t achieve the 25 ft lbs torque… instead, the bolts actually...
During my troubleshooting, I removed the Quicksilver thermostat and checked it on the stove (in a pot), along with a spare Sierra t-stat.
The Quicksilver opened right at 140F, and the Sierra opened closer to 150F and didn’t open as wide as the Quicksilver.
I recently purchased a supposed GLM 13230 (Mecruiser # 87290A4) on Amazon, and it's missing the hidden internal hole, and caused my 5.7 to overheat! Ughhh!!!!
This part also doesn't have the "GLM" letters cast into the housing, like the one I'm replacing, so it's suspect whether it's truly a...
Well… I just spoke to my mechanic that I’ve used off/on for the last 28 years…
He said he thinks he’s only changed one cast iron intake manifold for rusting through…and thinks I can continue to run this thing.
Interesting…
So…. I’m wondering if I should bother to replace the intake manifold…because it’s original since 1991.
Can that be done with motor remaining in boat…?
The block and heads were likely decent enough condition in 2007, when I got the rebuilt long block.
Yep… it’s a 1991; the long block was replaced in 2007 with a rebuilt, and that’s the original intake manifold. I don’t think they make this iron manifold anymore… “pre-vortec”, and I only have 1 inch clearance under the engine cover (i.e. deck), so I’m not sure if the vortec is a “high rise”...
5 - 10 years??? I’ve owned this ‘91 boat since 1999, and that’s the original intake manifold. I also know someone who owned a 1991 wellctaft with the same engine, and there’s wasn’t rotted out, yet, in 2019 when they got rid of it.
Ughh… I cross-threaded the brass shift cable housing part into my bell housing (Alpha One - “gen I”). I believe it’s a straight pipe thread; 1/4-18 NPS, while the shift cable housing has a tapered pipe fitting.
I plan to use a NPS tap to clean up threads, and see how damaged they are.
Has...
The answer to my question is YES.
I was able to replace the lower shift cable INCLUDING the shift cable bellows, without removing the bell housing.
I had to cut the bellows clamp off with a dremel, because I positioned it as they picture it throughout the merc service manual, but NOT how it’s...
