Hi, girlfriends 1996 Sentra GXE has a big issue with the timing chain and sprockets. The idler sprocket has basically no teeth left and is pretty much smooth. The girlfriend was able to nurse it home and we're in the process of trying to fix it. My question is that what's the possibility of the valves being bent up during her trying to nurse it home?
If they most likely got bent, I'm not going to even bother trying to fix it. It'd be too much time and money and would be easier to just buy a newer vehicle.
GA16DE timing chain/idler sprocket issue
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Wc240
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Re: GA16DE timing chain/idler sprocket issue (Red Devil)
doing a compression test will be the best way to tell
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nametakennow
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I want to say Nissans on the whole are non-interference, but do a search to confirm that. I may have it backwards. It's been awhile since we last had the possibility.
The quick test would be to see if out sounds and runs fine. Obviously if it's minor damage, a compression test will be the only real way to tell.
The quick test would be to see if out sounds and runs fine. Obviously if it's minor damage, a compression test will be the only real way to tell.
Re: (nametakennow)
Well I've got the valve cover, upper engine cover, and some miscellaneous bits off already. Mainly just checking to see if there was a way to determine it if the engine was in a non running configuration.
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blownb310
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Re: (Red Devil)
My '96 GA had the same thing go wrong five years ago. It only had like 65-k on it too. I simply replaced the worn idler gear and upper chain with good used ones from a parts engine. So other than a tube of gasket maker, the repair was free. It's still running great today.
The GA is an interference engine however. Verify that the cam timing has not jumped and do a compression test. If it has jumped, you've got a lot more work to do to find out if the valves hit the pistons. Namely, pull the cams out [which will close all the valves] and then do a cylinder leakdown test.
The GA is an interference engine however. Verify that the cam timing has not jumped and do a compression test. If it has jumped, you've got a lot more work to do to find out if the valves hit the pistons. Namely, pull the cams out [which will close all the valves] and then do a cylinder leakdown test.
Re: (blownb310)
fantastic. The timing has jumped btw. When getting the #1 piston TDC the chain kept jumping off the idler sprocket. Only looks like the #4 pistons intake valves are only partially down.
So basically I'm f***ed.
So basically I'm f***ed.
Re: GA16DE timing chain/idler sprocket issue (Red Devil)
FYI, found the culprit that caused the teeth to wear.
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