Blueghost924
Petty Officer 1st Class
- Joined
- Sep 19, 2013
- Messages
- 250
Mercruiser 470 3.7L - replacing exhaust elbow & shutters and got unpleasant surprises
Well, I've finished up a lot of the electrical wiring, and now I've shifted to the exhaust system. This is an engine I bought earlier this year and installed recently - and I knew the exhaust elbow and shutter needed to be replaced. Well, this afternoon I removed the exhaust elbow and didn't quite like what I saw. First, there was a little more rust and silt than I expected. Second, the 2 longer bolts snapped off at the base as you can see in one of the pictures. Third, it looks like the antifreeze passages are clogged? I've included a pic of the shutter retaining bar - yup the actual shutter is gone.
For the long bolts that snapped off at the base - advice on removing the stubs?
For the antifreeze passages that appear to be clogged - advice? My first thought is a shop vac while using a Dremel tool to drill away the blockages.
I've included a picture of the old exhaust elbow as well.
Well, I've finished up a lot of the electrical wiring, and now I've shifted to the exhaust system. This is an engine I bought earlier this year and installed recently - and I knew the exhaust elbow and shutter needed to be replaced. Well, this afternoon I removed the exhaust elbow and didn't quite like what I saw. First, there was a little more rust and silt than I expected. Second, the 2 longer bolts snapped off at the base as you can see in one of the pictures. Third, it looks like the antifreeze passages are clogged? I've included a pic of the shutter retaining bar - yup the actual shutter is gone.
For the long bolts that snapped off at the base - advice on removing the stubs?
For the antifreeze passages that appear to be clogged - advice? My first thought is a shop vac while using a Dremel tool to drill away the blockages.
I've included a picture of the old exhaust elbow as well.