Re: Overheating of straight 6 & 8 engines
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Would you recommend removing the core plugs from the get go on an engine that has been inactive for many years?
Not that hard to replace the core plugs on the side really? John
Posted on: 2016/12/28 18:16
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Re: Overheating of straight 6 & 8 engines
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Would you recommend removing the core plugs from the get go on an engine that has been inactive for many years?
Yes, absolutely. Localized overheating when it gets severe enough can be a precursor to cracked engine blocks! Core plugs are easy to install where you have adequate access to them - enough room to swing a hammer. Also drop and clean the oil pan.
Posted on: 2016/12/28 19:26
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Re: Overheating of straight 6 & 8 engines
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All excellent suggestions, removing welch plugs, and access covers to pressure wash and scrape deposits out of low flow areas in the block is the best way to go, IMO.
Also keep your timing light handy, in diagnosing overheating. I've seen a few cases where the idle speed was slightly high, resulting in the mechanical advance partially kicking in, when the distributor timing was being set. As a result the observed idle timing was on spec. but at higher engine speed the total advance was less, resulting in retarded timing, less performance, and over heating.
Posted on: 2016/12/29 14:27
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Re: Overheating of straight 6 & 8 engines
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Getting the accumulated stuff out is important. Some of that crud was also part of the engine at one time. Some other things accumulated too but mostly iron oxides. Not all corrosion is uniform, so you may just have a block that's in bad shape and not much you can do about it except replace. I posted similar remarks several years ago now. You can assess the condition better if torn down for rebuild. Cast iron won't last forever with water based coolant running through it. If it's going to sit, drain and dry it out.
Posted on: 2016/12/29 21:27
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Re: Overheating of straight 6 & 8 engines
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Mine has been drained out, willingly or not. All I know is there appears to be no water in the block. When that was done??? The hose between the AT cooler and water pump is rotten.....
John
Posted on: 2016/12/29 22:02
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