[makenzie71]

These are nothing like what's shown in the FSM for a QR25DE Frontier. Which one of these marks is suppose to be TDC? I've got the front cover and chain off and am now working on reassembly.

 

[Tomterrific]

Gosh, I'm surprised you didn't get an answer. I know this is a very old post but for posterity... In the direction of rotation, the first mark is idle ignition timing at a small advance. The second mark will be TDC. It should be that way on all engines.

Tom

 

[smj999smj]

Really does't matter as far as engine re-assembly as the crank pulley can only go on one way. Engine timing is determined by the colored links on the timing chains and the mating marks on the gears. The crank keyway should be straight up when installing the chains. The balancer chain should have an orange and a yellow painted link; the orange lines up with the appropriate mark on the crank gear and the yellow lines up with the timing mark on the balancer shaft gear. The primary timing chain should have three links with yellow paint marks on them. They'll line up with their appropriate marks on the camshaft and crankshaft gears, respectively. If those are all lined up properly, the engine is in-time.