Engine bottom end was overhauled, then head was overhauled and bearings, piston pins were free of wear,rocker rack was overhauled and all valvesseated and properly fixed, and yet when you start the engine sounds fine, but when you rev there is a prolonged squirmy noise coming from the head area.
Is there a chain drive to overhead cams? If so, maybe the tensioner, chain or gears are bad.
SOURCE: 1998 NISSAN ALTIMA FRONT END NOISE / RT SIDE GRINDING NOISE,.... BEARING?
CV joint has gotten debris and moisture inside. The CV boot is bad and not protecting the joint. Now its metal on metal grinding. This happens when turning as there is more pressure on the joint. Please fix this ASAP as it can be dangerous to drive on a bad CV joint. While I have seen people drive with a bad CV joint for over 4k miles, it is NOT recommended!
SOURCE: Belt whines and sounds like a bearing going,WD40 takes noise away
I'd remove the belt/belts and check all the idler pulleys. Did you retighten the belts or is it a single serpentine belt with an auto tensioner?
SOURCE: '98 Nissan Sentra GA13 guzzles
I encountered a very similar problem before. Have your carburetor redone. I also spent a lot trying to fix that kind of issue before with the car I'm using (also with ga13ds). I overhauled the carburetor 2 times using repair kits but there are still the same issues and at one time things became even worse. Bring it to a mechanic who works with nissan (not necessarily in the service center) and/or is specializing in carburetors because there are a lot of things that may go wrong inside a carburetor. I brought mine to an expert in Evangelista Makati, Philippines ( well I guess your from the Philippines because I could not find ga13ds from other countries unless I'm wrong) and it only took about two hours without even buying parts, just some elbow grease, smashing, scratching, and some salvaged parts from other carbs- the whole process cost me Php1,800 plus travel expenses. Also, buy a good air filter and make sure that your air cleaner assembly is working properly, these kind o issues are caused by accumulated dirt in the system and it slowly destroys the carb. After having all the repairs done, invest in one aerosol can of carb cleaner and use it on your carb maybe about once a month (I do it that often) it keeps performance as close to optimum as possible and prolongs the carb so it will take a while before it needs to be overhauled again. The MPG however, may not be the same as before. Since it's an old engine and engines tend to consume more fuel proportional to its age (according to my mech engineering undergrad brother), the MPG may be more by a bit and it is also affected by the engine overhaul, because of a lot machining and making things larger by a bit, the engine will increase cc (I think) by an amount that will also affect your MPG.
There..I hope this helps..Good luck! I love these old carbureted engines, they're so simple to tinker with.
If you're from the Philippines, the man to look for is Mang Vising in Bgy. Bankal, Makati. Just near the INC church there in Evangelsita. Coming from EDSA, turn right just before you reach the INC church and just ask around.
God bless!
SOURCE: suspension 1986 nissan 300z non-turbo. front end
How are the motor mounts? After all that work, you are down to only a few things it could be. good luck. Look for any bent suspension pieces. Does it have a sway bar up front? Check linkage and bushings on that.
SOURCE: 1996 nissan pathfinder rumbling 'rotational' noise from front
put the front up on jack stands and start inspecting push, pull, tug, ****, kick whatever you have to do to find out if anything is loose under the front end if you can't find anything put the whole thing up on jack stands then with the help of a trusted budy have him/her start and put the vehical in gear let idle see if you can hear the rumlbing. then very carfully slide under the vehical and listen. use a vaccum hose as a mechanics stethoscope, or use a long handle screwdriver or prybar to put on suspect bearing housing and listen for the grinding noises.
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