Coolant not reaching the rear cylinder - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 2 (permalink) Old 05-17-2017, 07:41 PM Thread Starter
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Coolant not reaching the rear cylinder

Hi guys!

New here. I just recently acquired a 1987 VN750 and decided to do a radiator flush and oil change (the previous owner said "I don't know" when asked about the last time he did it.) oil change went off without a hitch. The coolant flush not so much. When draining the system I got coolant coming out of everywhere except the rear cylinder head. Weird. Closed the drain plugs Added some more coolant. Checked that drain again. Nothing. Ran the engine for a bit. Checked it again. Nothing.

I'm at a loss. Any help will be appreciated.

(To answer as many questions as possible prior to posting I will add that it still runs. And other than melting my manlihood in hot weather traffic it doesn't really overheat)

Nick Gonzalez is offline  
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post #2 of 2 (permalink) Old 05-31-2017, 08:13 PM
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Hi Nick,

Those drainage holes may be clogged with corrosion or sediment.

Something similar happened to me when I bought my '96 last year. The only drain hole that actually drained was the one on the bottom of the engine, and the stuff I drained out of it looked like toxic waste. Apparently it hadn't been serviced in quite a while. Turns out that corrosion build up was preventing the drain holes from actually draining. I topped off the system with some distilled water and inserted a precision flat head screw driver into the drainage hole to gently scrape the corrosion until I got decent flow. You'll want to do this with all the drainage holes plugged except the one you are working on because you need the water pressure to push out the crap you're scraping so it doesn't go back into the water jacket.

Hope this helps. Maybe someone else can chime in and suggest some other things you should check while you're at it.

- Azimuth
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