It should be obvious which is correct though, as the hole in which the bolt resides should be an arc, therefore allowing adjustment. It should be noted that it inaccurate to set the timing to 15 degrees BTDC. At TDC its at the second from the left mark. If you want to be super paranoid, follow the Tomei diagram and count the teeth from the edge to the notch tooth. To not deform the bolt, a better practice is to use the Oil Pump Drive and Crank Pulley to turn the Crankshaft. Step 2 states “temporarily install the pulley bolt” to be able to turn the crankshaft. Before you can ever think about checking the timing, you have to borrow or buy a timing light. Connect a stroboscopic timing light to No.1 cylinder spark plug lead. Only the lines are visible, so this picture is a handle guide to the actual values of the lines. Can someone explain the timing marks on the RB25 crank pulley? Thanks, Chuck. I took off my valve cover and at TDC the cam gears are not lined up with the chain. its in a rwd sr20dett going into my 240sx. I did this! This is located in the same place as the distributor cap on non turbo engines: on the front right of the cam cover, directly above the coolant line. Due to mixing and matching the VVL FWD and SR20DET RWD conversion parts, the timing marks will not align correctly with the VVL oil pump when using the RWD crank pulley. Most dampers timing marks line up with the key-way". Repeat as needed to obtain the best setting. Not so loose the unit will move by itself, but just loose enough so that it will turn by hand. Verify that the timing dark grey chain markings all mate up with the sprocket notches and the exhaust dowel is 12 o’clock while crank pulley is 2nd notch (1st piston TDC). The best crank timing mark is to line the mark between the two dots on the crank sprocket. 4. Modern engines usually use a crank sensor directly connected to the engine management system . My car was set to about 17 degrees when it should have been 22. I would justify any minor difference between the marks through the size but it would be MINOR on this range. Turns out, as a member pointed out, my timing was off on my JZFC. Two 12 mm bolts are used to hold the swivelling piece in place. Re: Crank Pulley Timing Mark ? Or are the timing marks the same on a 170 and 200 engine? Fitting the light is simple. You must rev the motor three times to above approximately 3000 rpm, which settles the computer for the change. This is because the engine must be at its correct idle speed for the timing light to be accurate. if you dont know how to properly reference the cams and do the job get someone that lives around you off the forum to help you. To make the marks easy to read, give the pulley a spritz of black paint. SR20DET Forum (rear-drive) How to set your SR's timing in 30 minutes or less. Im not sure if the yellow mark(crankshaft mark) is lined up or not but my car seems to run fine. The crank pulley timing marks should be at the 2nd to the left mark while the notches on the exhaust cam sprocket is pointing perpendicular to the surface of the cylinder head, or at about the 12 o'clock position. It was funny cause I was lifting a car the other day at school and people were like,"No, thats not how u do it!". Several designs are outlined on www.autospeed.com.au, one of which I made with the provided instructions. Please note that 98 octane unleaded petrol is now always needed for safety. When using the VVL front cover, the timing pin is shorter, so it places the marks on the opposite side of the RWD pulley. Page 1 of 2 - Crank Pulley Timing Marks Query - posted in MX-5 / Roadster Forum: Is it possible to put the crank pulley that has the timing notches on it on wrong? 1 you are on overlap on cylinder 4 its as simple as that. The inductive clip is often fragile, so take care. Using a Q-tip or similar dobber, use WHITE paint to FILL the notches. I was like,"OK, which one of the many lift pionts do you want to lift the car from?". The NST SR20DET Crank Pulley drives two belts, eliminating the middle row! The piston may still be travelling up the bore in its compression stage, and is suddenly met with the force of the flame fronts trying to push it downwards, leaving no where for it to travel. This picture shows where the timing light is to be pointed, as shown in the picture above. so ive decided to do the timing chain on my SR20DET (redtop), now on the cam gears, there are 2 circles, can anyone please help and tell me where they are … 07-14-2005, 07:58 PM. This works like an extension cord for household electricity. I'm just trying to get it to factory spec, and really see how s4's are supposed to feel. You dont have to pull the pans and everything!just valve cover and tensioner. I have a unorthodox crank pulley and it's got the five timing marks but im not sure how to line it up. The danger however, is that the engine will be closer to detonation, which spells doom for any engine. A rev of the engine settled the rpm back down for the final reading to take place. Before the car was properly warmed up, the reading was around 40 degrees BTDC. Replace the spark plug, distributor cap and reconnect the battery. Are the timing marks on the pulleys in the same position? Another issue was that advancing the timing raised the idle, which sometimes would put it high enough to trigger the VTC, and throw the whole thing forward quite a bit. After warmup, your engine should be idling around 850rpm - check your timing with a timing gun. im pretty sure if you were off by 3 teeth you would have bent valves. I'm not sure if y'all understand what im trying to say or do but any input would be nice! It's the top bolt that is stripped. View Full Version : sr20det timing chain marks. The 15 degree mark is three marks ahead of the red TDC stripe on the pulley. Timing is adjustable with both a distributor and a crank angle sensor by rotating the unit. turn the motor over until they all line up. 63FuturaRag Registered User Posts: 123 Joined: Thu Nov 16, 2006 3:40 am Location: Middle Tennessee. This can be verified by looking at the crank pulley and the cam sprocket position. All four cylinder (CCW) hondas I'm aware of with cyl. that will be your true tdc. The marks should be made by aligning this template so that zero is at the top of the pulley where the crankcase split line is located. Post by … Like the SR20DE engine, the TPS needs to be disconnected and the engine revved about 3000 rpm three times to lock the timing. alright. If you want to change the ignition timing, then you must turn of the engine and disconnect the Throttle Position Sensor. one way to know that you are on tdc and the cams line up is to rotate the crank and put it on tdc, while watching the IN/EX lobes on cyl. Seat of the pants impression is that the car has that little bit more pace up top, jut enough to warrant the settings to be permanent. The unit pictured cost me around $50 and is a basic timing light. when you are on tdc on cyl. -----Many after-market degree wheel pulleys are wildly inaccurate, being off by as much as five degrees. 15 degrees btdc is the second mark from the right looking at the motor from the front. The same timing chain cover was used for both ‘64 & ‘65 and had just a simple pointer. A sticker like the one pictured may be found somewhere in the engine bay, and the ever important factory ignition timing setting. Title: SR20.PDF Author: none Created Date: 7/30/2001 11:17:27 AM Say at 4000 rpm at 100% load (open throttle) the mapping inside the ecu might electronically run the car at 18 degrees Before Top Dead Centre. Tried to check timing today and when I point the timing light down at the crank pulley instead of the timing marks appearing to "stand still" they look like they are slowly rotating counter clockwise. Hee hee, I said "cock". Anyone with a 20V able to confirm when they've set the timing or have one sitting on a stand waiting to go in? 12303-54C00 N14-SR20DET We are comparing two different sized circles at very close distance having difference only 2cm/0.7874". The base ignition timing is controlled by the distributor on the SR20DE. to make sure they are set right, you have to re-set the chain manually, by purring the timing cover, which requires pulling the tensioner, upper and lower pans, and crankshaft pulley. APEXi APEXi 507-N004 Dual Funnel Power Intake Kit … Only the lines are visible, so this picture is a handle guide to the actual values of the lines. Go to TDC on hte block, and check your marks on the timing gears, see if they are in the correct O'clock position. Did u cock the tensioner back , or did u just try to jam it in there? At TDC its at the second from the left mark. These should be available from generic automotive stores such as Auto 1, Super Cheap Auto, Repco, etc. The timing can be adjusted by loosening and slightly rotating the distributor in its seat. I just bought a timing light but not sure if i should just put the cam gears back to line up with the dark links or if maybe the chain has slipped the cam and crank gears by three teeth all together. Sponsored by Wiring Specialties. the rim of the crankshaft pulley. Other engines may be controlled by a Crank Angle sensor, which works on a similar principle. "A couple of Nissan Sr20's will pull a premium one week before race wars." After, it was locked at 22. There is a loop at the rear of the cam cover for attaching the timing light pickup, although the internet seems to think this is unreliable, despite the FSM telling us to use it. PyR0NiAk Posts: 4447 Joined: Sun Mar 01, 2009 4:29 pm Car: S13 SR W/ T2 GT3071R .86AR, JWT S4 Cams, 810cc Injectors,Z32 MAF, JWT tuned ECU 87mm 9:1 Compression CP pistons, Manley Rods Location: Ohio … Another cause of detonation is lean fuel mixtures, which raises cylinder temperatures dramatically. The result is the piston rattling from side to side, which after not too long has the nasty effect of smashing the rings on the piston. Turn on ignition switch. Beyond.ca - Car Forums - Automotive Enthusiasts Community > Car Forums > Performance and Handling > Mechanical > sr20det timing chain marks. To change the timing, the bolts holding the distributor to the engine need to be loosened. Considering the timing light is the only cost and be used on any car, and that the timing can be changed an infinite number of times, I feel the modification was worth while. Start your engine and let it warm up to normal operating temperature. I believe they … Using a ratchet on the crank pulley, hand crank the engine until the #1 piston is at TDC. If the base timing is forward 3 degrees, then the actual timing will be 21 degrees BTDC. If so we’re all good! Yeah, time it on any cylinder, 1 through 4, if you know what you are doing. It is obvious then that detonation must be avoided at all costs. 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